depolymerization

commit f0133d33be5b1666d20b640c57a497bc239caba5
parent 491410969b1fec9c0e01def555a970f02c3d76af
Author: Antoine A <>
Date:   Tue, 30 Nov 2021 12:25:14 +0100

Rename refund to bounce and improve error handling

Diffstat:
M
Cargo.lock
 | 
3173
++++++++++++++++++++++++++++++++++++++++---------------------------------------
M
btc-wire/Cargo.toml
 | 
2
++
M
btc-wire/benches/metadata.rs
 | 
4
++--
M
btc-wire/src/bin/btc-wire-cli.rs
 | 
8
++++----
M
btc-wire/src/bin/test.rs
 | 
70
+++++++++++++++++++++++++++++++++++++++++++++++++---------------------
M
btc-wire/src/lib.rs
 | 
462
++++++++++---------------------------------------------------------------------
M
btc-wire/src/main.rs
 | 
2
+-
A
btc-wire/src/rpc_utils.rs
 | 
177
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
btc-wire/src/segwit.rs
 | 
149
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
btc-wire/src/test.rs
 | 
11
+++++++++++
M
script/test_bank.sh
 | 
8
++++----
M
wire-gateway/src/main.rs
 | 
731
+++++++++++++++++++++++++++++++++++++++----------------------------------------

12 files changed, 2410 insertions(+), 2387 deletions(-)
diff --git a/Cargo.lock b/Cargo.lock
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+ "cfg-if",
+ "wasm-bindgen-macro",
+]
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+ "bumpalo",
+ "lazy_static",
+ "log",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
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+]
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+ "quote",
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+ "wasm-bindgen-shared",
+]
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+ "js-sys",
+ "wasm-bindgen",
+]
+
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
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+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
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+ "winapi",
+]
+
+[[package]]
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+dependencies = [
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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+
+[[package]]
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+checksum = "51d5158a43cc43623c0729d1ad6647e62fa384a3d135fd15108d37c683461f64"
+
+[[package]]
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+checksum = "bc31f409f565611535130cfe7ee8e6655d3fa99c1c61013981e491921b5ce954"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.28.0"
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+checksum = "3f2b8c7cbd3bfdddd9ab98769f9746a7fad1bca236554cd032b78d768bc0e89f"
+
+[[package]]
+name = "wire-gateway"
+version = "0.1.0"
+dependencies = [
+ "async-compression",
+ "base32",
+ "btc-wire",
+ "hyper",
+ "rand",
+ "serde",
+ "serde_json",
+ "serde_urlencoded",
+ "serde_with",
+ "thiserror",
+ "tokio",
+ "url",
+]
diff --git a/btc-wire/Cargo.toml b/btc-wire/Cargo.toml
@@ -20,6 +20,8 @@ fastrand = "1.5.0"
 serde = { version = "1.0.130", features = ["derive"] }
 # Zero allocation terminal color
 owo-colors = "3.1.0"
+# Error macros
+thiserror = "1.0.30"
 
 [dev-dependencies]
 # statistics-driven micro-benchmarks
diff --git a/btc-wire/benches/metadata.rs b/btc-wire/benches/metadata.rs
@@ -1,6 +1,6 @@
 use btc_wire::{
-    decode_segwit_msg, encode_segwit_key,
-    utils::{rand_addresses, rand_key},
+    segwit::{decode_segwit_msg, encode_segwit_key, rand_addresses},
+    test::rand_key,
 };
 use criterion::{criterion_group, criterion_main, Criterion};
 
diff --git a/btc-wire/src/bin/btc-wire-cli.rs b/btc-wire/src/bin/btc-wire-cli.rs
@@ -3,8 +3,8 @@ use bitcoincore_rpc::{
     Client, RpcApi,
 };
 use btc_wire::{
-    rpc::{common_rpc, dirty_guess_network, wallet_rpc, Network},
-    utils::rand_key,
+    rpc_utils::{common_rpc, dirty_guess_network, wallet_rpc, Network},
+    test::rand_key,
     ClientExtended,
 };
 
@@ -48,7 +48,7 @@ struct TransferCmd {
 #[argh(subcommand, name = "nblock")]
 /// Wait or mine the next block
 struct NextBlockCmd {
-    #[argh(option, short = 't', default = "String::from(\"reserve\")")]
+    #[argh(option, short = 't', default = "String::from(\"wire\")")]
     /// receiver wallet
     to: String,
 }
@@ -114,7 +114,7 @@ fn main() {
     match args.cmd {
         Cmd::Init(_) => app.init(),
         Cmd::Transfer(TransferCmd {
-            key,
+            key: _key,
             from,
             to,
             amount,
diff --git a/btc-wire/src/bin/test.rs b/btc-wire/src/bin/test.rs
@@ -4,14 +4,19 @@ use std::{collections::HashSet, iter::repeat_with, panic::AssertUnwindSafe};
 use bitcoincore_rpc::{
     bitcoin::{Address, Amount, Txid},
     json::GetTransactionResultDetailCategory as Category,
-    jsonrpc::serde_json::{json, Value},
+    jsonrpc::{
+        error::RpcError,
+        serde_json::{json, Value},
+    },
     Client, RpcApi,
 };
 use btc_wire::{
-    refund,
-    rpc::{common_rpc, dirty_guess_network, network_dir_path, wallet_rpc, Network, CLIENT, WIRE},
-    utils::rand_key,
-    ClientExtended,
+    rpc_patch::RpcErrorCode,
+    rpc_utils::{
+        common_rpc, dirty_guess_network, network_dir_path, wallet_rpc, Network, CLIENT, WIRE,
+    },
+    test::rand_key,
+    BounceErr, ClientExtended,
 };
 use owo_colors::OwoColorize;
 
@@ -215,16 +220,16 @@ pub fn main() {
         assert_eq!(key, extracted, "Corrupted metadata");
     });
 
-    let refund_fee = Amount::from_sat(300);
-    runner.test("Refund simple", || {
+    let bounce_fee = Amount::from_sat(300);
+    runner.test("Bounce simple", || {
         let before = client_rpc.get_balance(None, None).unwrap();
         let send_id = client_rpc
             .send_to_address(&wire_addr, test_amount, None, None, None, None, None, None)
             .unwrap();
         wait_for_tx(&client_rpc, &[send_id]);
-        let refund_id = refund(&wire_rpc, &send_id, refund_fee).unwrap();
-        wait_for_tx(&wire_rpc, &[refund_id]);
-        let refund_tx_fee = wire_rpc.get_transaction(&refund_id, None).unwrap().details[0]
+        let bounce_id = wire_rpc.bounce(&send_id, bounce_fee).unwrap();
+        wait_for_tx(&wire_rpc, &[bounce_id]);
+        let bounce_tx_fee = wire_rpc.get_transaction(&bounce_id, None).unwrap().details[0]
             .fee
             .unwrap()
             .abs()
@@ -237,9 +242,10 @@ pub fn main() {
             .to_unsigned()
             .unwrap();
         let after = client_rpc.get_balance(None, None).unwrap();
-        assert_eq!(before - after, refund_tx_fee + refund_fee + send_tx_fee);
+        assert!(before >= after);
+        assert_eq!(before - after, bounce_tx_fee + bounce_fee + send_tx_fee);
     });
-    runner.test("Refund minimal amount", || {
+    runner.test("Bounce minimal amount", || {
         let send_id = client_rpc
             .send_to_address(
                 &wire_addr,
@@ -253,13 +259,19 @@ pub fn main() {
             )
             .unwrap();
         wait_for_tx(&client_rpc, &[send_id]);
-        assert!(refund(&wire_rpc, &send_id, refund_fee).is_err());
+        assert!(match wire_rpc.bounce(&send_id, bounce_fee) {
+            Ok(_) => false,
+            Err(err) => match err {
+                BounceErr::AmountLessThanFee => true,
+                _ => false,
+            },
+        });
     });
-    runner.test("Refund too small amount", || {
+    runner.test("Bounce too small amount", || {
         let send_id = client_rpc
             .send_to_address(
                 &wire_addr,
-                Amount::from_sat(294) + refund_fee,
+                Amount::from_sat(294) + bounce_fee,
                 None,
                 None,
                 None,
@@ -269,9 +281,24 @@ pub fn main() {
             )
             .unwrap();
         wait_for_tx(&client_rpc, &[send_id]);
-        assert!(refund(&wire_rpc, &send_id, refund_fee).is_err());
+
+        assert!(match wire_rpc.bounce(&send_id, bounce_fee) {
+            Ok(_) => false,
+            Err(err) => match err {
+                BounceErr::RPC(err) => match err {
+                    bitcoincore_rpc::Error::JsonRpc(err) => match err {
+                        bitcoincore_rpc::jsonrpc::Error::Rpc(RpcError { code, .. }) => {
+                            code == RpcErrorCode::RpcWalletInsufficientFunds as i32
+                        }
+                        _ => false,
+                    },
+                    _ => false,
+                },
+                _ => false,
+            },
+        });
     });
-    runner.test("Refund complex", || {
+    runner.test("Bounce complex", || {
         // Generate 6 new addresses
         let addresses: Vec<Address> =
             repeat_with(|| client_rpc.get_new_address(None, None).unwrap())
@@ -332,10 +359,10 @@ pub fn main() {
             .unwrap();
         let send_id = client_rpc.send_raw_transaction(&signed.hex).unwrap();
         wait_for_tx(&client_rpc, &[send_id]);
-        let refund_id = refund(&wire_rpc, &send_id, refund_fee).unwrap();
-        wait_for_tx(&wire_rpc, &[refund_id]);
+        let bounce_id = wire_rpc.bounce(&send_id, bounce_fee).unwrap();
+        wait_for_tx(&wire_rpc, &[bounce_id]);
         let after = client_rpc.get_balance(None, None).unwrap();
-        let refund_tx_fee = wire_rpc.get_transaction(&refund_id, None).unwrap().details[0]
+        let bounce_tx_fee = wire_rpc.get_transaction(&bounce_id, None).unwrap().details[0]
             .fee
             .unwrap()
             .abs()
@@ -347,7 +374,8 @@ pub fn main() {
             .abs()
             .to_unsigned()
             .unwrap();
-        assert_eq!(before - after, refund_tx_fee + refund_fee + send_tx_fee);
+        assert!(before >= after);
+        assert_eq!(before - after, bounce_tx_fee + bounce_fee + send_tx_fee);
     });
 
     runner.conclude();
diff --git a/btc-wire/src/lib.rs b/btc-wire/src/lib.rs
@@ -1,4 +1,4 @@
-use bech32::{u5, FromBase32, ToBase32, Variant};
+pub use bitcoincore_rpc;
 use bitcoincore_rpc::{
     bitcoin::{
         hashes::hex::{FromHex, ToHex},
@@ -8,217 +8,43 @@ use bitcoincore_rpc::{
     jsonrpc::serde_json::{json, Value},
     Client, RpcApi,
 };
-use rand::{rngs::OsRng, RngCore};
 use rpc_patch::{ClientPatched, GetTransactionFull};
-
-use crate::{
-    rpc_patch::{rpc_error, RpcErrorCode},
-    utils::rand_key,
-};
+use rpc_utils::{segwit_min_amount, send_many, sender_address};
+use segwit::{decode_segwit_msg, encode_segwit_key};
 
 pub mod rpc_patch;
-pub use bitcoincore_rpc;
-
-/// Minimum dust amount to perform a transaction to a segwit address
-fn segwit_min_amount() -> Amount {
-    // https://github.com/bitcoin/bitcoin/blob/master/src/policy/policy.cpp
-    return Amount::from_sat(294);
-}
-
-/// Encode metadata into a segwit address
-fn encode_segwit_addr(hrp: &str, metada: &[u8; 20]) -> String {
-    // We use the version 0 with bech32 encoding
-    let mut buf = vec![u5::try_from_u8(0).unwrap()];
-    buf.extend_from_slice(&metada.to_base32());
-    bech32::encode(hrp, buf, Variant::Bech32).unwrap()
-}
-
-/// Encode half of a 32B key into a segwit address
-fn encode_segwit_key_half(
-    hrp: &str,
-    is_first: bool,
-    magic_id: &[u8; 4],
-    key_half: &[u8; 16],
-) -> String {
-    // Combine magic_it and the key half
-    let mut buf = [0u8; 20];
-    buf[..4].copy_from_slice(magic_id);
-    buf[4..].copy_from_slice(key_half);
-    // Toggle first bit for ordering
-    if is_first {
-        buf[0] &= 0b0111_1111 // Unset first bit
-    } else {
-        buf[0] |= 0b1000_0000 // Set first bit
-    }
-    // Encode into an fake segwit address
-    encode_segwit_addr(hrp, &buf)
-}
-
-/// Encode a 32B key into two segwit adresses
-pub fn encode_segwit_key(hrp: &str, msg: &[u8; 32]) -> [String; 2] {
-    // Generate a random magic identifier
-    let mut magic_id = [0; 4];
-    OsRng.fill_bytes(&mut magic_id);
-    // Split key in half;
-    let split: (&[u8; 16], &[u8; 16]) =
-        (msg[..16].try_into().unwrap(), msg[16..].try_into().unwrap());
-    [
-        encode_segwit_key_half(hrp, true, &magic_id, &split.0),
-        encode_segwit_key_half(hrp, false, &magic_id, &split.1),
-    ]
+pub mod rpc_utils;
+pub mod segwit;
+pub mod test;
+
+#[derive(Debug, thiserror::Error)]
+pub enum BounceErr {
+    #[error("Expected 'receive' transaction")]
+    NotAReceiveTransaction,
+    #[error("Transaction amount less than bounce fee")]
+    AmountLessThanFee,
+    #[error(transparent)]
+    RPC(#[from] bitcoincore_rpc::Error),
 }
 
-#[derive(Debug, Clone)]
-pub enum DecodeError {
-    TooManyAddress,
-    MissingSeqWitAddress,
-    MagicIdCollision,
+#[derive(Debug, thiserror::Error)]
+pub enum GetSegwitErr {
+    #[error(transparent)]
+    Decode(#[from] segwit::DecodeSegWitErr),
+    #[error(transparent)]
+    RPC(#[from] bitcoincore_rpc::Error),
 }
 
-/// Decode a 32B key into from adresses
-pub fn decode_segwit_msg(segwit_addrs: &[impl AsRef<str>]) -> Result<[u8; 32], DecodeError> {
-    if segwit_addrs.len() < 2 {
-        return Err(DecodeError::MissingSeqWitAddress);
-    }
-
-    if segwit_addrs.len() > 4 {
-        return Err(DecodeError::TooManyAddress);
-    }
-
-    // Extract parts from every addresses
-    let decoded: Vec<(bool, [u8; 4], [u8; 16])> = segwit_addrs
-        .into_iter()
-        .filter_map(|addr| {
-            bech32::decode(addr.as_ref()).ok().and_then(|(_, wp, _)| {
-                // Skip version
-                let pg: Vec<u8> = Vec::from_base32(&wp[1..]).unwrap();
-                if pg.len() == 20 {
-                    let mut magic_id: [u8; 4] = pg[..4].try_into().unwrap();
-                    let key_half: [u8; 16] = pg[4..].try_into().unwrap();
-                    let is_first = !pg[0] & 0b1000_0000 == 0;
-                    // Clear first bit
-                    magic_id[0] &= 0b0111_1111;
-                    Some((is_first, magic_id, key_half))
-                } else {
-                    None
-                }
-            })
-        })
-        .collect();
-
-    if decoded.len() < 2 {
-        return Err(DecodeError::MissingSeqWitAddress);
-    }
-    // Keep only the addresses with duplicated magic id
-    let matches: Vec<&(bool, [u8; 4], [u8; 16])> = decoded
-        .iter()
-        .filter(|(_, magic, _)| {
-            decoded
-                .iter()
-                .filter(|(_, other, _)| other == magic)
-                .count()
-                > 1
-        })
-        .collect();
-
-    if matches.len() != 2 {
-        println!("Magic id collision");
-    return Ok(rand_key());
-    }
-    assert_eq!(matches.len(), 2, "Magic ID collision");
-
-    let mut key = [0; 32];
-    for (is_first, _, half) in matches {
-        key[*is_first as usize * 16..][..16].copy_from_slice(half);
-    }
-    Ok(key)
-}
-
-/// Send transaction to multiple recipients
-fn send_many(
-    client: &Client,
-    recipients: Vec<(String, Amount)>,
-    fee_from: Vec<String>,
-) -> bitcoincore_rpc::Result<Txid> {
-    let amounts = Value::Object(
-        recipients
-            .into_iter()
-            .map(|(addr, amount)| (addr, amount.as_btc().into()))
-            .collect(),
-    );
-    client.call(
-        "sendmany",
-        &[
-            "".into(),       // dummy
-            amounts,         // amounts
-            0.into(),        // minconf
-            "".into(),       // comment
-            fee_from.into(), // substractfeefrom
-            false.into(),    // replaceable
-            Value::Null,     // conf_target
-            Value::Null,     // estimate mode
-            1.into(),        // fee rate
-            false.into(),    // verbose
-        ],
-    )
-}
-
-/// Get the first sender address from a raw transaction
-pub fn sender_address(rpc: &Client, full: &GetTransactionFull) -> bitcoincore_rpc::Result<Address> {
-    let first = &full.decoded.vin[0];
-    let tx = rpc.get_raw_tx(&first.txid.unwrap())?;
-    Ok(tx
-        .vout
-        .into_iter()
-        .find(|it| it.n == first.vout.unwrap())
-        .unwrap()
-        .script_pub_key
-        .address
-        .unwrap())
-}
-
-/// Refund a transaction
-///
-/// There is no reliable way to refund a transaction as you cannot know if the addresses used are shared
-///
-/// This is not a best-effort solution but a reasonable one
-pub fn refund(rpc: &Client, id: &Txid, refund_fee: Amount) -> bitcoincore_rpc::Result<Txid> {
-    // TODO handle insufficient_funds error
-    let full = rpc.get_transaction_full(id)?;
-    let detail = &full.tx.details[0];
-    assert_eq!(detail.category, Category::Receive);
-
-    let amount = detail.amount.to_unsigned().unwrap();
-    if amount <= refund_fee {
-        return Err(rpc_error(
-            RpcErrorCode::RpcWalletInsufficientFunds,
-            "The refund amount is inferior to the refund fee".to_string(),
-        ));
-    }
-
-    // List all addresses
-    let mut addresses = Vec::new();
-    for vin in full.decoded.vin {
-        if let Some(id) = &vin.txid {
-            let tx = rpc.get_raw_tx(id)?;
-            let it = tx.vout.iter().find(|it| it.n == vin.vout.unwrap()).unwrap();
-            addresses.push(it.script_pub_key.address.as_ref().unwrap().to_string());
-        }
-    }
-
-    // Split received amount (minus refund fee) equally to each addresses
-    let split = (amount - refund_fee) / addresses.len() as u64;
-    let recipients: Vec<(String, Amount)> =
-        addresses.iter().map(|addr| (addr.clone(), split)).collect();
-    // Send refund making recipient pay the transaction fees
-    let id = send_many(rpc, recipients, addresses)?;
-    Ok(id)
+#[derive(Debug, thiserror::Error)]
+pub enum GetOpReturnErr {
+    #[error("Missing opreturn")]
+    MissingOpReturn,
+    #[error(transparent)]
+    RPC(#[from] bitcoincore_rpc::Error),
 }
 
 /// An extended bitcoincore JSON-RPC api client who can send and retrieve metadata with their transaction
 pub trait ClientExtended {
-    // TODO error handling for get functions
-
     /// Send a transaction with a 32B key as metadata encoded using fake segwit addresses
     fn send_segwit_key(
         &self,
@@ -228,10 +54,7 @@ pub trait ClientExtended {
     ) -> bitcoincore_rpc::Result<Txid>;
 
     /// Get detailed information about an in-wallet transaction and it's 32B metadata key encoded using fake segwit addresses
-    fn get_tx_segwit_key(
-        &self,
-        id: &Txid,
-    ) -> bitcoincore_rpc::Result<(GetTransactionFull, [u8; 32])>;
+    fn get_tx_segwit_key(&self, id: &Txid) -> Result<(GetTransactionFull, [u8; 32]), GetSegwitErr>;
 
     /// Send a transaction with metadata encoded using OP_RETURN
     fn send_op_return(
@@ -242,8 +65,14 @@ pub trait ClientExtended {
     ) -> bitcoincore_rpc::Result<Txid>;
 
     /// Get detailed information about an in-wallet transaction and its op_return metadata
-    fn get_tx_op_return(&self, id: &Txid)
-        -> bitcoincore_rpc::Result<(GetTransactionFull, Vec<u8>)>;
+    fn get_tx_op_return(&self, id: &Txid) -> Result<(GetTransactionFull, Vec<u8>), GetOpReturnErr>;
+
+    /// Bounce a transaction bask to its sender
+    ///
+    /// There is no reliable way to bounce a transaction as you cannot know if the addresses
+    /// used are shared or come from a third-party service. We only send back to the first input
+    /// address as a best-effort gesture.
+    fn bounce(&self, id: &Txid, bounce_fee: Amount) -> Result<Txid, BounceErr>;
 }
 
 impl ClientExtended for Client {
@@ -268,10 +97,7 @@ impl ClientExtended for Client {
         send_many(self, recipients, Vec::new())
     }
 
-    fn get_tx_segwit_key(
-        &self,
-        id: &Txid,
-    ) -> bitcoincore_rpc::Result<(GetTransactionFull, [u8; 32])> {
+    fn get_tx_segwit_key(&self, id: &Txid) -> Result<(GetTransactionFull, [u8; 32]), GetSegwitErr> {
         let full = self.get_transaction_full(id)?;
 
         let addresses: Vec<String> = full
@@ -286,8 +112,7 @@ impl ClientExtended for Client {
             })
             .collect();
 
-        // TODO error handling
-        let metadata = decode_segwit_msg(&addresses).unwrap();
+        let metadata = decode_segwit_msg(&addresses)?;
 
         Ok((full, metadata))
     }
@@ -320,10 +145,7 @@ impl ClientExtended for Client {
         self.send_raw_transaction(&signed.hex)
     }
 
-    fn get_tx_op_return(
-        &self,
-        id: &Txid,
-    ) -> bitcoincore_rpc::Result<(GetTransactionFull, Vec<u8>)> {
+    fn get_tx_op_return(&self, id: &Txid) -> Result<(GetTransactionFull, Vec<u8>), GetOpReturnErr> {
         let full = self.get_transaction_full(id)?;
 
         let op_return_out = full
@@ -331,201 +153,35 @@ impl ClientExtended for Client {
             .vout
             .iter()
             .find(|it| it.script_pub_key.type_ == ScriptPubkeyType::NullData)
-            // TODO error handling
-            .unwrap();
+            .ok_or(GetOpReturnErr::MissingOpReturn)?;
+
         let hex = op_return_out.script_pub_key.asm.split_once(' ').unwrap().1;
+        // Op return payload is always encoded in hexadecimal
         let metadata = Vec::from_hex(hex).unwrap();
 
         Ok((full, metadata))
     }
-}
-
-pub mod utils {
-    use crate::{encode_segwit_addr, encode_segwit_key};
 
-    pub fn rand_key() -> [u8; 32] {
-        let mut key = [0; 32];
-        key.fill_with(|| fastrand::u8(..));
-        key
-    }
-
-    pub fn rand_data() -> [u8; 20] {
-        let mut key = [0; 20];
-        key.fill_with(|| fastrand::u8(..));
-        key
-    }
-
-    pub fn rand_addresses(hrp: &str, key: &[u8; 32]) -> Vec<String> {
-        let mut rng_address: Vec<String> =
-            std::iter::repeat_with(|| encode_segwit_addr(hrp, &rand_data()))
-                .take(2)
-                .collect();
-
-        let mut addresses = encode_segwit_key(hrp, &key).to_vec();
-        addresses.append(&mut rng_address);
-        fastrand::shuffle(&mut addresses);
-        addresses
-    }
-}
-
-pub mod rpc {
-    use std::{path::PathBuf, str::FromStr};
-
-    use bitcoincore_rpc::{
-        bitcoin::{BlockHash, Txid},
-        json::{GetTransactionResultDetailCategory, ListTransactionResult},
-        Auth, Client, RpcApi,
-    };
-
-    pub const CLIENT: &str = "client";
-    pub const WIRE: &str = "wire";
-
-    /// Bitcoin networks
-    #[derive(Debug, Clone, Copy, PartialEq, Eq)]
-    pub enum Network {
-        MainNet,
-        TestNet,
-        RegTest,
-    }
-
-    impl Network {
-        pub fn dir(&self) -> &'static str {
-            match self {
-                Network::MainNet => "main",
-                Network::TestNet => "testnet3",
-                Network::RegTest => "regtest",
-            }
-        }
-    }
-
-    pub fn rpc_url(network: Network) -> String {
-        let port = match network {
-            Network::MainNet => 8332,
-            Network::TestNet => 18332,
-            Network::RegTest => 18443,
-        };
-        format!("https://127.0.0.1:{}", port)
-    }
-
-    pub fn data_dir_path() -> PathBuf {
-        // https://github.com/bitcoin/bitcoin/blob/master/doc/bitcoin-conf.md#:~:text=By%20default%2C%20the%20configuration%20file,file%3E%20option%20in%20the%20bitcoin.
-        if cfg!(target_os = "windows") {
-            PathBuf::from_str(&std::env::var("APPDATA").unwrap())
-                .unwrap()
-                .join("Bitcoin")
-        } else if cfg!(target_os = "linux") {
-            PathBuf::from_str(&std::env::var("HOME").unwrap())
-                .unwrap()
-                .join(".bitcoin")
-        } else if cfg!(target_os = "macos") {
-            PathBuf::from_str(&std::env::var("HOME").unwrap())
-                .unwrap()
-                .join("Library/Application Support/Bitcoin")
-        } else {
-            unimplemented!("Only windows, linux or macos")
-        }
-    }
-
-    pub fn network_dir_path(network: Network) -> PathBuf {
-        data_dir_path().join(network.dir())
-    }
-
-    pub fn common_rpc(network: Network) -> bitcoincore_rpc::Result<Client> {
-        Client::new(
-            &rpc_url(network),
-            Auth::CookieFile(network_dir_path(network).join(".cookie")),
-        )
-    }
-
-    pub fn wallet_rpc(network: Network, wallet: &str) -> Client {
-        Client::new(
-            &format!("{}/wallet/{}", rpc_url(network), wallet),
-            Auth::CookieFile(network_dir_path(network).join(".cookie")),
-        )
-        .expect(&format!("Failed to open wallet '{}' client", wallet))
-    }
-
-    pub fn last_transaction(rpc: &Client) -> bitcoincore_rpc::Result<Txid> {
-        Ok(rpc
-            .list_transactions(None, None, None, None)?
-            .last()
-            .unwrap()
-            .info
-            .txid)
-    }
-
-    pub fn received_since(
-        rpc: &Client,
-        hash: Option<&BlockHash>,
-    ) -> bitcoincore_rpc::Result<(Vec<Txid>, BlockHash)> {
-        let result = rpc.list_since_block(hash, Some(1), None, None)?;
-        let mut received: Vec<&ListTransactionResult> = result
-            .transactions
-            .iter()
-            .filter(|it| {
-                it.info.confirmations > 0
-                    && it.detail.category == GetTransactionResultDetailCategory::Receive
-            })
-            .collect();
-        received.sort_unstable_by_key(|it| it.info.time);
-        received.reverse();
-        Ok((
-            received.into_iter().map(|it| it.info.txid).collect(),
-            result.lastblock,
-        ))
-    }
-
-    pub fn dirty_guess_network() -> Network {
-        let result_reg = common_rpc(Network::RegTest).and_then(|rpc| rpc.get_network_info());
-        if result_reg.is_ok() {
-            return Network::RegTest;
-        }
-        let result_test = common_rpc(Network::TestNet).and_then(|rpc| rpc.get_network_info());
-        if result_test.is_ok() {
-            return Network::TestNet;
+    fn bounce(&self, id: &Txid, bounce_fee: Amount) -> Result<Txid, BounceErr> {
+        let full = self.get_transaction_full(id)?;
+        let detail = &full.tx.details[0];
+        if detail.category != Category::Receive {
+            return Err(BounceErr::NotAReceiveTransaction);
         }
 
-        let result_main = common_rpc(Network::MainNet).and_then(|rpc| rpc.get_network_info());
-        if result_main.is_ok() {
-            return Network::MainNet;
+        let amount = detail.amount.to_unsigned().unwrap();
+        if amount <= bounce_fee {
+            return Err(BounceErr::AmountLessThanFee);
         }
 
-        unreachable!(
-            "Failed to connect to any chain\nreg: {:?}\ntest: {:?}\nmain: {:?}",
-            result_reg, result_main, result_test
-        );
-    }
-}
-
-#[cfg(test)]
-mod test {
-    use crate::{
-        decode_segwit_msg, encode_segwit_key,
-        utils::{rand_addresses, rand_key},
-    };
-
-    #[test]
-    fn test_shuffle() {
-        for _ in 0..1000 {
-            let key = rand_key();
-            let mut addresses = encode_segwit_key("test", &key);
-            fastrand::shuffle(&mut addresses);
-            let decoded =
-                decode_segwit_msg(&addresses.iter().map(|s| s.as_str()).collect::<Vec<&str>>())
-                    .unwrap();
-            assert_eq!(key, decoded);
-        }
-    }
-
-    #[test]
-    fn test_shuffle_many() {
-        for _ in 0..1000 {
-            let key = rand_key();
-            let addresses = rand_addresses("test", &key);
-            let decoded =
-                decode_segwit_msg(&addresses.iter().map(|s| s.as_str()).collect::<Vec<&str>>())
-                    .unwrap();
-            assert_eq!(key, decoded);
-        }
+        let sender = sender_address(self, &full)?;
+        let bounce_amount = amount - bounce_fee;
+        // Send refund making recipient pay the transaction fees
+        let id = send_many(
+            self,
+            vec![(sender.to_string(), bounce_amount)],
+            vec![sender.to_string()],
+        )?;
+        Ok(id)
     }
 }
diff --git a/btc-wire/src/main.rs b/btc-wire/src/main.rs
@@ -2,7 +2,7 @@ use std::{collections::HashSet, str::FromStr, time::Duration};
 
 use bitcoincore_rpc::{bitcoin::Amount, RpcApi};
 use btc_wire::{
-    rpc::{
+    rpc_utils::{
         common_rpc, dirty_guess_network, network_dir_path, received_since, wallet_rpc, CLIENT, WIRE,
     },
     ClientExtended,
diff --git a/btc-wire/src/rpc_utils.rs b/btc-wire/src/rpc_utils.rs
@@ -0,0 +1,177 @@
+use std::{path::PathBuf, str::FromStr};
+
+use bitcoincore_rpc::{
+    bitcoin::{BlockHash, Txid, Amount, Address},
+    json::{GetTransactionResultDetailCategory, ListTransactionResult},
+    Auth, Client, RpcApi, jsonrpc::serde_json::Value,
+};
+
+use crate::rpc_patch::{GetTransactionFull, ClientPatched};
+
+pub const CLIENT: &str = "client";
+pub const WIRE: &str = "wire";
+
+/// Bitcoin networks
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Network {
+    MainNet,
+    TestNet,
+    RegTest,
+}
+
+impl Network {
+    pub fn dir(&self) -> &'static str {
+        match self {
+            Network::MainNet => "main",
+            Network::TestNet => "testnet3",
+            Network::RegTest => "regtest",
+        }
+    }
+}
+
+pub fn rpc_url(network: Network) -> String {
+    let port = match network {
+        Network::MainNet => 8332,
+        Network::TestNet => 18332,
+        Network::RegTest => 18443,
+    };
+    format!("https://127.0.0.1:{}", port)
+}
+
+pub fn data_dir_path() -> PathBuf {
+    // https://github.com/bitcoin/bitcoin/blob/master/doc/bitcoin-conf.md#:~:text=By%20default%2C%20the%20configuration%20file,file%3E%20option%20in%20the%20bitcoin.
+    if cfg!(target_os = "windows") {
+        PathBuf::from_str(&std::env::var("APPDATA").unwrap())
+            .unwrap()
+            .join("Bitcoin")
+    } else if cfg!(target_os = "linux") {
+        PathBuf::from_str(&std::env::var("HOME").unwrap())
+            .unwrap()
+            .join(".bitcoin")
+    } else if cfg!(target_os = "macos") {
+        PathBuf::from_str(&std::env::var("HOME").unwrap())
+            .unwrap()
+            .join("Library/Application Support/Bitcoin")
+    } else {
+        unimplemented!("Only windows, linux or macos")
+    }
+}
+
+pub fn network_dir_path(network: Network) -> PathBuf {
+    data_dir_path().join(network.dir())
+}
+
+pub fn common_rpc(network: Network) -> bitcoincore_rpc::Result<Client> {
+    Client::new(
+        &rpc_url(network),
+        Auth::CookieFile(network_dir_path(network).join(".cookie")),
+    )
+}
+
+pub fn wallet_rpc(network: Network, wallet: &str) -> Client {
+    Client::new(
+        &format!("{}/wallet/{}", rpc_url(network), wallet),
+        Auth::CookieFile(network_dir_path(network).join(".cookie")),
+    )
+    .expect(&format!("Failed to open wallet '{}' client", wallet))
+}
+
+pub fn last_transaction(rpc: &Client) -> bitcoincore_rpc::Result<Txid> {
+    Ok(rpc
+        .list_transactions(None, None, None, None)?
+        .last()
+        .unwrap()
+        .info
+        .txid)
+}
+
+pub fn received_since(
+    rpc: &Client,
+    hash: Option<&BlockHash>,
+) -> bitcoincore_rpc::Result<(Vec<Txid>, BlockHash)> {
+    let result = rpc.list_since_block(hash, Some(1), None, None)?;
+    let mut received: Vec<&ListTransactionResult> = result
+        .transactions
+        .iter()
+        .filter(|it| {
+            it.info.confirmations > 0
+                && it.detail.category == GetTransactionResultDetailCategory::Receive
+        })
+        .collect();
+    received.sort_unstable_by_key(|it| it.info.time);
+    received.reverse();
+    Ok((
+        received.into_iter().map(|it| it.info.txid).collect(),
+        result.lastblock,
+    ))
+}
+
+pub fn dirty_guess_network() -> Network {
+    let result_reg = common_rpc(Network::RegTest).and_then(|rpc| rpc.get_network_info());
+    if result_reg.is_ok() {
+        return Network::RegTest;
+    }
+    let result_test = common_rpc(Network::TestNet).and_then(|rpc| rpc.get_network_info());
+    if result_test.is_ok() {
+        return Network::TestNet;
+    }
+
+    let result_main = common_rpc(Network::MainNet).and_then(|rpc| rpc.get_network_info());
+    if result_main.is_ok() {
+        return Network::MainNet;
+    }
+
+    unreachable!(
+        "Failed to connect to any chain\nreg: {:?}\ntest: {:?}\nmain: {:?}",
+        result_reg, result_main, result_test
+    );
+}
+
+/// Minimum dust amount to perform a transaction to a segwit address
+pub fn segwit_min_amount() -> Amount {
+    // https://github.com/bitcoin/bitcoin/blob/master/src/policy/policy.cpp
+    return Amount::from_sat(294);
+}
+
+/// Send transaction to multiple recipients
+pub fn send_many(
+    client: &Client,
+    recipients: Vec<(String, Amount)>,
+    fee_from: Vec<String>,
+) -> bitcoincore_rpc::Result<Txid> {
+    let amounts = Value::Object(
+        recipients
+            .into_iter()
+            .map(|(addr, amount)| (addr, amount.as_btc().into()))
+            .collect(),
+    );
+    client.call(
+        "sendmany",
+        &[
+            "".into(),       // dummy
+            amounts,         // amounts
+            0.into(),        // minconf
+            "".into(),       // comment
+            fee_from.into(), // substractfeefrom
+            false.into(),    // replaceable
+            Value::Null,     // conf_target
+            Value::Null,     // estimate mode
+            1.into(),        // fee rate
+            false.into(),    // verbose
+        ],
+    )
+}
+
+/// Get the first sender address from a raw transaction
+pub fn sender_address(rpc: &Client, full: &GetTransactionFull) -> bitcoincore_rpc::Result<Address> {
+    let first = &full.decoded.vin[0];
+    let tx = rpc.get_raw_tx(&first.txid.unwrap())?;
+    Ok(tx
+        .vout
+        .into_iter()
+        .find(|it| it.n == first.vout.unwrap())
+        .unwrap()
+        .script_pub_key
+        .address
+        .unwrap())
+}
diff --git a/btc-wire/src/segwit.rs b/btc-wire/src/segwit.rs
@@ -0,0 +1,149 @@
+use bech32::{u5, ToBase32, Variant, FromBase32};
+use rand::{rngs::OsRng, RngCore};
+
+use crate::test::rand_data;
+
+/// Encode metadata into a segwit address
+fn encode_segwit_addr(hrp: &str, metada: &[u8; 20]) -> String {
+    // We use the version 0 with bech32 encoding
+    let mut buf = vec![u5::try_from_u8(0).unwrap()];
+    buf.extend_from_slice(&metada.to_base32());
+    bech32::encode(hrp, buf, Variant::Bech32).unwrap()
+}
+
+/// Encode half of a 32B key into a segwit address
+fn encode_segwit_key_half(
+    hrp: &str,
+    is_first: bool,
+    magic_id: &[u8; 4],
+    key_half: &[u8; 16],
+) -> String {
+    // Combine magic_it and the key half
+    let mut buf = [0u8; 20];
+    buf[..4].copy_from_slice(magic_id);
+    buf[4..].copy_from_slice(key_half);
+    // Toggle first bit for ordering
+    if is_first {
+        buf[0] &= 0b0111_1111 // Unset first bit
+    } else {
+        buf[0] |= 0b1000_0000 // Set first bit
+    }
+    // Encode into an fake segwit address
+    encode_segwit_addr(hrp, &buf)
+}
+
+/// Encode a 32B key into two segwit adresses
+pub fn encode_segwit_key(hrp: &str, msg: &[u8; 32]) -> [String; 2] {
+    // Generate a random magic identifier
+    let mut magic_id = [0; 4];
+    OsRng.fill_bytes(&mut magic_id);
+    // Split key in half;
+    let split: (&[u8; 16], &[u8; 16]) =
+        (msg[..16].try_into().unwrap(), msg[16..].try_into().unwrap());
+    [
+        encode_segwit_key_half(hrp, true, &magic_id, &split.0),
+        encode_segwit_key_half(hrp, false, &magic_id, &split.1),
+    ]
+}
+
+#[derive(Debug, Clone, thiserror::Error)]
+pub enum DecodeSegWitErr {
+    #[error("There is less than 2 segwit addresses")]
+    MissingSegWitAddress,
+    #[error("More than two addresses are sharing the same magic id")]
+    MagicIdCollision,
+}
+
+/// Decode a 32B key into from adresses
+pub fn decode_segwit_msg(segwit_addrs: &[impl AsRef<str>]) -> Result<[u8; 32], DecodeSegWitErr> {
+    // Extract parts from every addresses
+    let decoded: Vec<(bool, [u8; 4], [u8; 16])> = segwit_addrs
+        .into_iter()
+        .filter_map(|addr| {
+            bech32::decode(addr.as_ref()).ok().and_then(|(_, wp, _)| {
+                // Skip version
+                let pg: Vec<u8> = Vec::from_base32(&wp[1..]).unwrap();
+                if pg.len() == 20 {
+                    let mut magic_id: [u8; 4] = pg[..4].try_into().unwrap();
+                    let key_half: [u8; 16] = pg[4..].try_into().unwrap();
+                    let is_first = !pg[0] & 0b1000_0000 == 0;
+                    // Clear first bit
+                    magic_id[0] &= 0b0111_1111;
+                    Some((is_first, magic_id, key_half))
+                } else {
+                    None
+                }
+            })
+        })
+        .collect();
+
+    if decoded.len() < 2 {
+        return Err(DecodeSegWitErr::MissingSegWitAddress);
+    }
+    // Keep only the addresses with duplicated magic id
+    let matches: Vec<&(bool, [u8; 4], [u8; 16])> = decoded
+        .iter()
+        .filter(|(_, magic, _)| {
+            decoded
+                .iter()
+                .filter(|(_, other, _)| other == magic)
+                .count()
+                > 1
+        })
+        .collect();
+
+    if matches.len() != 2 {
+        return Err(DecodeSegWitErr::MagicIdCollision);
+    }
+
+    let mut key = [0; 32];
+    for (is_first, _, half) in matches {
+        key[*is_first as usize * 16..][..16].copy_from_slice(half);
+    }
+    Ok(key)
+}
+
+pub fn rand_addresses(hrp: &str, key: &[u8; 32]) -> Vec<String> {
+    let mut rng_address: Vec<String> =
+        std::iter::repeat_with(|| encode_segwit_addr(hrp, &rand_data()))
+            .take(2)
+            .collect();
+
+    let mut addresses = encode_segwit_key(hrp, &key).to_vec();
+    addresses.append(&mut rng_address);
+    fastrand::shuffle(&mut addresses);
+    addresses
+}
+
+#[cfg(test)]
+mod test {
+    use crate::{
+        segwit::{decode_segwit_msg, encode_segwit_key, rand_addresses},
+        test::rand_key,
+    };
+
+    #[test]
+    fn test_shuffle() {
+        for _ in 0..1000 {
+            let key = rand_key();
+            let mut addresses = encode_segwit_key("test", &key);
+            fastrand::shuffle(&mut addresses);
+            let decoded =
+                decode_segwit_msg(&addresses.iter().map(|s| s.as_str()).collect::<Vec<&str>>())
+                    .unwrap();
+            assert_eq!(key, decoded);
+        }
+    }
+
+    #[test]
+    fn test_shuffle_many() {
+        for _ in 0..1000 {
+            let key = rand_key();
+            let addresses = rand_addresses("test", &key);
+            let decoded =
+                decode_segwit_msg(&addresses.iter().map(|s| s.as_str()).collect::<Vec<&str>>())
+                    .unwrap();
+            assert_eq!(key, decoded);
+        }
+    }
+}
diff --git a/btc-wire/src/test.rs b/btc-wire/src/test.rs
@@ -0,0 +1,11 @@
+pub fn rand_key() -> [u8; 32] {
+    let mut key = [0; 32];
+    key.fill_with(|| fastrand::u8(..));
+    key
+}
+
+pub fn rand_data() -> [u8; 20] {
+    let mut key = [0; 20];
+    key.fill_with(|| fastrand::u8(..));
+    key
+}
diff --git a/script/test_bank.sh b/script/test_bank.sh
@@ -20,13 +20,13 @@ echo "OK"
 BANK_ENDPOINT=http://localhost:8080/
 
 echo -n "Making wire transfer to exchange ..."
-btc-wire-cli transfer 0.0004
+btc-wire-cli transfer 0.00004
 btc-wire-cli nblock
 echo " OK"
 
 echo -n "Requesting exchange incoming transaction list ..."
 
-taler-exchange-wire-gateway-client -b $BANK_ENDPOINT -i | grep BTC:0.0004 > /dev/null
+taler-exchange-wire-gateway-client -b $BANK_ENDPOINT -i | grep BTC:0.00004 > /dev/null
 
 echo " OK"
 
@@ -36,14 +36,14 @@ ADDRESS=`bitcoin-cli -rpcwallet=wire getnewaddress`
 taler-exchange-wire-gateway-client \
     -b $BANK_ENDPOINT \
     -C payto://bitcoin/$ADDRESS \
-    -a BTC:0.0002 > /dev/null
+    -a BTC:0.00002 > /dev/null
 btc-wire-cli nblock
 echo " OK"
 
 
 echo -n "Requesting exchange's outgoing transaction list..."
 
-taler-exchange-wire-gateway-client -b $BANK_ENDPOINT -o | grep BTC:0.0002 > /dev/null
+taler-exchange-wire-gateway-client -b $BANK_ENDPOINT -o | grep BTC:0.00002 > /dev/null
 
 echo " OK"
 echo "All tests passed"
diff --git a/wire-gateway/src/main.rs b/wire-gateway/src/main.rs
@@ -1,366 +1,365 @@
-use std::{
-    str::FromStr,
-    time::{Duration, SystemTime},
-};
-
-use api_common::{Amount, SafeUint64, ShortHashCode, Timestamp};
-use api_wire::{OutgoingBankTransaction, OutgoingHistory};
-use async_compression::tokio::bufread::ZlibDecoder;
-use btc_wire::{
-    bitcoincore_rpc::{
-        bitcoin::{Address, Amount as BtcAmount, BlockHash},
-        json::GetTransactionResultDetailCategory as Category,
-        Client, RpcApi,
-    },
-    rpc::{common_rpc, dirty_guess_network, wallet_rpc},
-    sender_address, ClientExtended,
-};
-use error_codes::ErrorCode;
-use hyper::{
-    header,
-    http::request::Parts,
-    service::{make_service_fn, service_fn},
-    Body, Error, Method, Request, Response, Server, StatusCode,
-};
-use tokio::{io::AsyncReadExt, sync::Mutex};
-use url::Url;
-
-use crate::{
-    api_common::{Base32, ErrorDetail},
-    api_wire::{
-        AddIncomingRequest, AddIncomingResponse, HistoryParams, IncomingBankTransaction,
-        IncomingHistory, TransferRequest, TransferResponse,
-    },
-};
-
-mod error_codes;
-
-fn bitcoin_payto(addr: &Address) -> Url {
-    Url::from_str(&format!("payto://bitcoin/{}", addr.to_string())).unwrap()
-}
-
-impl Into<Amount> for BtcAmount {
-    fn into(self) -> Amount {
-        let sat = self.as_sat();
-        return Amount::new("BTC", sat / 100_000_000, ((sat % 100_000_000) / 10) as u32);
-    }
-}
-
-impl TryFrom<Amount> for BtcAmount {
-    type Error = String;
-
-    fn try_from(value: Amount) -> Result<Self, Self::Error> {
-        if value.currency != "BTC" {
-            return Err("Wrong currency".to_string());
-        }
-
-        let sat = value.value * 100_000_000 + value.fraction as u64 * 10;
-        return Ok(Self::from_sat(sat));
-    }
-}
-
-#[tokio::main]
-async fn main() {
-    let network = dirty_guess_network();
-    {
-        let common = common_rpc(network).unwrap();
-        common.load_wallet("wire").ok();
-    }
-    let state = ServerState {
-        incoming: Mutex::new(Vec::new()),
-        outgoing: Mutex::new(Vec::new()),
-        client: Mutex::new(wallet_rpc(network, "wire")),
-    };
-    let state: &'static ServerState = Box::leak(Box::new(state));
-
-    // BTC worker thread
-
-    std::thread::spawn(move || {
-        let rpc = wallet_rpc(network, "wire");
-        let mut last_hash: Option<BlockHash> = None;
-        let confirmation = 1;
-
-        loop {
-            let txs = rpc
-                .list_since_block(last_hash.as_ref(), Some(confirmation), None, Some(true))
-                .unwrap();
-            let self_addr = rpc.get_new_address(None, None).unwrap();
-            last_hash = Some(txs.lastblock);
-
-            for tx in txs
-                .transactions
-                .into_iter()
-                .filter(|tx| tx.info.confirmations >= confirmation as i32)
-            {
-                let id = &tx.info.txid;
-                match tx.detail.category {
-                    Category::Send => match rpc.get_tx_op_return(&id) {
-                        Ok((full, wtid)) => {
-                            let sender = sender_address(&rpc, &full).unwrap();
-                            let credit_account = bitcoin_payto(&sender);
-                            let debit_account = bitcoin_payto(&self_addr);
-                            let time = tx.info.blocktime.unwrap();
-                            let date =
-                                Timestamp::from(SystemTime::UNIX_EPOCH + Duration::from_secs(time));
-                            let amount = (tx.detail.amount * -1).to_unsigned().unwrap().into();
-                            let mut lock = state.outgoing.blocking_lock();
-                            println!(
-                                "Send {} {} {:?} {}",
-                                &debit_account, &credit_account, &date, &amount
-                            );
-                            let array: [u8; 32] = wtid[..32].try_into().unwrap();
-                            let wtid = Base32::from(array);
-                            let row_id = lock.len() as u64 + 1;
-                            lock.push(OutgoingTransaction {
-                                row_id: SafeUint64::try_from(row_id).unwrap(),
-                                date,
-                                amount,
-                                debit_account,
-                                credit_account,
-                                wtid,
-                            });
-                        }
-                        Err(err) => println!("receive: {}", err),
-                    },
-                    Category::Receive => match rpc.get_tx_segwit_key(&id) {
-                        Ok((full, reserve_pub)) => {
-                            let sender = sender_address(&rpc, &full).unwrap();
-                            let debit_account = bitcoin_payto(&sender);
-                            let credit_account = bitcoin_payto(tx.detail.address.as_ref().unwrap());
-                            let time = tx.info.blocktime.unwrap();
-                            let date =
-                                Timestamp::from(SystemTime::UNIX_EPOCH + Duration::from_secs(time));
-                            let amount = tx.detail.amount.to_unsigned().unwrap().into();
-                            let mut lock = state.incoming.blocking_lock();
-                            println!(
-                                "Receive {} {} {:?} {}",
-                                &debit_account, &credit_account, &date, &amount
-                            );
-                            let row_id = lock.len() as u64 + 1;
-                            lock.push(IncomingTransaction {
-                                row_id: SafeUint64::try_from(row_id).unwrap(),
-                                date,
-                                amount,
-                                reserve_pub: reserve_pub.into(),
-                                debit_account,
-                                credit_account,
-                            });
-                        }
-                        Err(err) => println!("receive: {}", err),
-                    },
-                    Category::Generate | Category::Immature | Category::Orphan => {}
-                }
-            }
-
-            rpc.wait_for_new_block(0).ok();
-        }
-    });
-
-    let addr = ([0, 0, 0, 0], 8080).into();
-    let make_service = make_service_fn(move |_| async move {
-        Ok::<_, Error>(service_fn(move |req| async move {
-            let response = match router(req, state).await {
-                Ok(resp) => resp,
-                Err((status, err)) => {
-                    json_response(
-                        status,
-                        &ErrorDetail {
-                            code: err as i64,
-                            hint: None,
-                            detail: None,
-                            parameter: None,
-                            path: None,
-                            offset: None,
-                            index: None,
-                            object: None,
-                            currency: None,
-                            type_expected: None,
-                            type_actual: None,
-                        },
-                    )
-                    .await
-                }
-            };
-            Ok::<Response<Body>, Error>(response)
-        }))
-    });
-
-    let server = Server::bind(&addr).serve(make_service);
-
-    println!("Server listening on http://{}", addr);
-
-    if let Err(e) = server.await {
-        eprintln!("server error: {}", e);
-    }
-}
-
-struct IncomingTransaction {
-    row_id: SafeUint64,
-    date: Timestamp,
-    amount: Amount,
-    reserve_pub: ShortHashCode,
-    debit_account: Url,
-    credit_account: Url,
-}
-
-struct OutgoingTransaction {
-    row_id: SafeUint64,
-    date: Timestamp,
-    amount: Amount,
-    wtid: ShortHashCode,
-    debit_account: Url,
-    credit_account: Url,
-}
-
-struct ServerState {
-    incoming: Mutex<Vec<IncomingTransaction>>,
-    outgoing: Mutex<Vec<OutgoingTransaction>>,
-    client: Mutex<Client>,
-}
-
-pub mod api_common;
-pub mod api_wire;
-
-async fn parse_json<J: serde::de::DeserializeOwned>(parts: &Parts, body: Body) -> J {
-    let bytes = hyper::body::to_bytes(body).await.unwrap();
-    let mut buf = Vec::new();
-    let decompressed = if parts
-        .headers
-        .get(header::CONTENT_ENCODING)
-        .map(|it| it == "deflate")
-        .unwrap_or(false)
-    {
-        let mut decoder = ZlibDecoder::new(bytes.as_ref());
-        decoder.read_to_end(&mut buf).await.unwrap();
-        &buf
-    } else {
-        bytes.as_ref()
-    };
-
-    serde_json::from_slice(&decompressed).unwrap()
-}
-
-async fn json_response<J: serde::Serialize>(status: StatusCode, json: &J) -> Response<Body> {
-    let json = serde_json::to_vec(json).unwrap();
-    /*  let mut encoder = ZlibEncoder::new(Vec::new());
-    encoder.write_all(&json).await.unwrap();
-    encoder.shutdown().await.unwrap();
-
-    let encoded = encoder.into_inner();*/
-    Response::builder()
-        .status(status)
-        .header(header::CONTENT_TYPE, "application/json")
-        //.header(header::CONTENT_ENCODING, "deflate")
-        .body(Body::from(json))
-        .unwrap()
-}
-
-type ServerErr = (StatusCode, ErrorCode);
-
-fn assert_method(parts: &Parts, method: Method) -> Result<(), ServerErr> {
-    if parts.method == method {
-        Ok(())
-    } else {
-        Err((
-            StatusCode::METHOD_NOT_ALLOWED,
-            ErrorCode::GENERIC_METHOD_INVALID,
-        ))
-    }
-}
-
-async fn router(
-    req: Request<Body>,
-    state: &'static ServerState,
-) -> Result<Response<Body>, (StatusCode, ErrorCode)> {
-    let (parts, body) = req.into_parts();
-    let response = match parts.uri.path() {
-        "/transfer" => {
-            assert_method(&parts, Method::POST)?;
-            let request: TransferRequest = parse_json(&parts, body).await;
-            let client = state.client.lock().await;
-            let address = request.credit_account.path().trim_start_matches('/');
-            dbg!(address);
-            let to = Address::from_str(address).unwrap();
-            let amount: BtcAmount = request.amount.try_into().unwrap();
-            client
-                .send_op_return(&to, amount, request.wtid.as_ref())
-                .unwrap();
-            let timestamp = Timestamp::now();
-            json_response(
-                StatusCode::OK,
-                &TransferResponse {
-                    timestamp,
-                    row_id: SafeUint64::try_from(0).unwrap(),
-                },
-            )
-            .await
-        }
-        "/history/incoming" => {
-            assert_method(&parts, Method::GET)?;
-            let params: HistoryParams =
-                serde_urlencoded::from_str(parts.uri.query().unwrap_or("")).unwrap();
-            let guard = state.incoming.lock().await;
-            let transactions: Vec<IncomingBankTransaction> = guard
-                .iter()
-                .map(|tx| IncomingBankTransaction::IncomingReserveTransaction {
-                    row_id: tx.row_id,
-                    date: tx.date,
-                    amount: tx.amount.clone(),
-                    credit_account: tx.credit_account.clone(),
-                    debit_account: tx.debit_account.clone(),
-                    reserve_pub: tx.reserve_pub.clone(),
-                })
-                .collect();
-            json_response(
-                StatusCode::OK,
-                &IncomingHistory {
-                    incoming_transactions: transactions,
-                },
-            )
-            .await
-        }
-        "/history/outgoing" => {
-            assert_method(&parts, Method::GET)?;
-            let params: HistoryParams =
-                serde_urlencoded::from_str(parts.uri.query().unwrap_or("")).unwrap();
-            let guard = state.outgoing.lock().await;
-            let transactions: Vec<OutgoingBankTransaction> = guard
-                .iter()
-                .map(|tx| OutgoingBankTransaction {
-                    row_id: tx.row_id,
-                    date: tx.date,
-                    amount: tx.amount.clone(),
-                    credit_account: tx.credit_account.clone(),
-                    wtid: tx.wtid.clone(),
-                    debit_account: tx.debit_account.clone(),
-                    exchange_base_url: Url::parse("http://localhost:8080").unwrap(),
-                })
-                .collect();
-            json_response(
-                StatusCode::OK,
-                &OutgoingHistory {
-                    outgoing_transactions: transactions,
-                },
-            )
-            .await
-        }
-        "/admin/add-incoming" => {
-            assert_method(&parts, Method::POST)?;
-            let request: AddIncomingRequest = parse_json(&parts, body).await;
-            let mut guard = state.incoming.lock().await;
-            let row_id = SafeUint64::try_from(guard.len() as u64 + 1).unwrap();
-            let timestamp = Timestamp::now();
-            guard.push(IncomingTransaction {
-                row_id,
-                date: timestamp,
-                amount: request.amount,
-                reserve_pub: request.reserve_pub,
-                debit_account: request.debit_account,
-                credit_account: Url::parse("payto://bitcoin").unwrap(),
-            });
-            json_response(StatusCode::OK, &AddIncomingResponse { timestamp, row_id }).await
-        }
-        _ => return Err((StatusCode::NOT_FOUND, ErrorCode::GENERIC_ENDPOINT_UNKNOWN)),
-    };
-    return Ok(response);
-}
+use std::{
+    str::FromStr,
+    time::{Duration, SystemTime},
+};
+
+use api_common::{Amount, SafeUint64, ShortHashCode, Timestamp};
+use api_wire::{OutgoingBankTransaction, OutgoingHistory};
+use async_compression::tokio::bufread::ZlibDecoder;
+use btc_wire::{
+    bitcoincore_rpc::{
+        bitcoin::{Address, Amount as BtcAmount, BlockHash},
+        json::GetTransactionResultDetailCategory as Category,
+        Client, RpcApi,
+    },
+    rpc_utils::{common_rpc, dirty_guess_network, sender_address, wallet_rpc},
+    ClientExtended,
+};
+use error_codes::ErrorCode;
+use hyper::{
+    header,
+    http::request::Parts,
+    service::{make_service_fn, service_fn},
+    Body, Error, Method, Request, Response, Server, StatusCode,
+};
+use tokio::{io::AsyncReadExt, sync::Mutex};
+use url::Url;
+
+use crate::{
+    api_common::{Base32, ErrorDetail},
+    api_wire::{
+        AddIncomingRequest, AddIncomingResponse, HistoryParams, IncomingBankTransaction,
+        IncomingHistory, TransferRequest, TransferResponse,
+    },
+};
+
+mod error_codes;
+
+fn bitcoin_payto(addr: &Address) -> Url {
+    Url::from_str(&format!("payto://bitcoin/{}", addr.to_string())).unwrap()
+}
+
+impl Into<Amount> for BtcAmount {
+    fn into(self) -> Amount {
+        let sat = self.as_sat();
+        return Amount::new("BTC", sat / 100_000_000, ((sat % 100_000_000) / 10) as u32);
+    }
+}
+
+impl TryFrom<Amount> for BtcAmount {
+    type Error = String;
+
+    fn try_from(value: Amount) -> Result<Self, Self::Error> {
+        if value.currency != "BTC" {
+            return Err("Wrong currency".to_string());
+        }
+
+        let sat = value.value * 100_000_000 + value.fraction as u64 * 10;
+        return Ok(Self::from_sat(sat));
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let network = dirty_guess_network();
+    {
+        let common = common_rpc(network).unwrap();
+        common.load_wallet("wire").ok();
+    }
+    let state = ServerState {
+        incoming: Mutex::new(Vec::new()),
+        outgoing: Mutex::new(Vec::new()),
+        client: Mutex::new(wallet_rpc(network, "wire")),
+    };
+    let state: &'static ServerState = Box::leak(Box::new(state));
+
+    // BTC worker thread
+
+    std::thread::spawn(move || {
+        let rpc = wallet_rpc(network, "wire");
+        let mut last_hash: Option<BlockHash> = None;
+        let confirmation = 1;
+
+        loop {
+            let txs = rpc
+                .list_since_block(last_hash.as_ref(), Some(confirmation), None, Some(true))
+                .unwrap();
+            let self_addr = rpc.get_new_address(None, None).unwrap();
+            last_hash = Some(txs.lastblock);
+
+            for tx in txs
+                .transactions
+                .into_iter()
+                .filter(|tx| tx.info.confirmations >= confirmation as i32)
+            {
+                let id = &tx.info.txid;
+                match tx.detail.category {
+                    Category::Send => match rpc.get_tx_op_return(&id) {
+                        Ok((full, wtid)) => {
+                            let sender = sender_address(&rpc, &full).unwrap();
+                            let credit_account = bitcoin_payto(&sender);
+                            let debit_account = bitcoin_payto(&self_addr);
+                            let time = tx.info.blocktime.unwrap();
+                            let date =
+                                Timestamp::from(SystemTime::UNIX_EPOCH + Duration::from_secs(time));
+                            let amount = tx.detail.amount.abs().to_unsigned().unwrap().into();
+                            let mut lock = state.outgoing.blocking_lock();
+                            println!(
+                                "Send {} {} {:?} {}",
+                                &debit_account, &credit_account, &date, &amount
+                            );
+                            let array: [u8; 32] = wtid[..32].try_into().unwrap();
+                            let wtid = Base32::from(array);
+                            let row_id = lock.len() as u64 + 1;
+                            lock.push(OutgoingTransaction {
+                                row_id: SafeUint64::try_from(row_id).unwrap(),
+                                date,
+                                amount,
+                                debit_account,
+                                credit_account,
+                                wtid,
+                            });
+                        }
+                        Err(err) => println!("receive: {}", err),
+                    },
+                    Category::Receive => match rpc.get_tx_segwit_key(&id) {
+                        Ok((full, reserve_pub)) => {
+                            let sender = sender_address(&rpc, &full).unwrap();
+                            let debit_account = bitcoin_payto(&sender);
+                            let credit_account = bitcoin_payto(tx.detail.address.as_ref().unwrap());
+                            let time = tx.info.blocktime.unwrap();
+                            let date =
+                                Timestamp::from(SystemTime::UNIX_EPOCH + Duration::from_secs(time));
+                            let amount = tx.detail.amount.to_unsigned().unwrap().into();
+                            let mut lock = state.incoming.blocking_lock();
+                            println!(
+                                "Receive {} {} {:?} {}",
+                                &debit_account, &credit_account, &date, &amount
+                            );
+                            let row_id = lock.len() as u64 + 1;
+                            lock.push(IncomingTransaction {
+                                row_id: SafeUint64::try_from(row_id).unwrap(),
+                                date,
+                                amount,
+                                reserve_pub: reserve_pub.into(),
+                                debit_account,
+                                credit_account,
+                            });
+                        }
+                        Err(err) => println!("receive: {}", err),
+                    },
+                    Category::Generate | Category::Immature | Category::Orphan => {}
+                }
+            }
+
+            rpc.wait_for_new_block(0).ok();
+        }
+    });
+
+    let addr = ([0, 0, 0, 0], 8080).into();
+    let make_service = make_service_fn(move |_| async move {
+        Ok::<_, Error>(service_fn(move |req| async move {
+            let response = match router(req, state).await {
+                Ok(resp) => resp,
+                Err((status, err)) => {
+                    json_response(
+                        status,
+                        &ErrorDetail {
+                            code: err as i64,
+                            hint: None,
+                            detail: None,
+                            parameter: None,
+                            path: None,
+                            offset: None,
+                            index: None,
+                            object: None,
+                            currency: None,
+                            type_expected: None,
+                            type_actual: None,
+                        },
+                    )
+                    .await
+                }
+            };
+            Ok::<Response<Body>, Error>(response)
+        }))
+    });
+
+    let server = Server::bind(&addr).serve(make_service);
+
+    println!("Server listening on http://{}", addr);
+
+    if let Err(e) = server.await {
+        eprintln!("server error: {}", e);
+    }
+}
+
+struct IncomingTransaction {
+    row_id: SafeUint64,
+    date: Timestamp,
+    amount: Amount,
+    reserve_pub: ShortHashCode,
+    debit_account: Url,
+    credit_account: Url,
+}
+
+struct OutgoingTransaction {
+    row_id: SafeUint64,
+    date: Timestamp,
+    amount: Amount,
+    wtid: ShortHashCode,
+    debit_account: Url,
+    credit_account: Url,
+}
+
+struct ServerState {
+    incoming: Mutex<Vec<IncomingTransaction>>,
+    outgoing: Mutex<Vec<OutgoingTransaction>>,
+    client: Mutex<Client>,
+}
+
+pub mod api_common;
+pub mod api_wire;
+
+async fn parse_json<J: serde::de::DeserializeOwned>(parts: &Parts, body: Body) -> J {
+    let bytes = hyper::body::to_bytes(body).await.unwrap();
+    let mut buf = Vec::new();
+    let decompressed = if parts
+        .headers
+        .get(header::CONTENT_ENCODING)
+        .map(|it| it == "deflate")
+        .unwrap_or(false)
+    {
+        let mut decoder = ZlibDecoder::new(bytes.as_ref());
+        decoder.read_to_end(&mut buf).await.unwrap();
+        &buf
+    } else {
+        bytes.as_ref()
+    };
+
+    serde_json::from_slice(&decompressed).unwrap()
+}
+
+async fn json_response<J: serde::Serialize>(status: StatusCode, json: &J) -> Response<Body> {
+    let json = serde_json::to_vec(json).unwrap();
+    /*  let mut encoder = ZlibEncoder::new(Vec::new());
+    encoder.write_all(&json).await.unwrap();
+    encoder.shutdown().await.unwrap();
+
+    let encoded = encoder.into_inner();*/
+    Response::builder()
+        .status(status)
+        .header(header::CONTENT_TYPE, "application/json")
+        //.header(header::CONTENT_ENCODING, "deflate")
+        .body(Body::from(json))
+        .unwrap()
+}
+
+type ServerErr = (StatusCode, ErrorCode);
+
+fn assert_method(parts: &Parts, method: Method) -> Result<(), ServerErr> {
+    if parts.method == method {
+        Ok(())
+    } else {
+        Err((
+            StatusCode::METHOD_NOT_ALLOWED,
+            ErrorCode::GENERIC_METHOD_INVALID,
+        ))
+    }
+}
+
+async fn router(
+    req: Request<Body>,
+    state: &'static ServerState,
+) -> Result<Response<Body>, (StatusCode, ErrorCode)> {
+    let (parts, body) = req.into_parts();
+    let response = match parts.uri.path() {
+        "/transfer" => {
+            assert_method(&parts, Method::POST)?;
+            let request: TransferRequest = parse_json(&parts, body).await;
+            let client = state.client.lock().await;
+            let address = request.credit_account.path().trim_start_matches('/');
+            let to = Address::from_str(address).unwrap();
+            let amount: BtcAmount = request.amount.try_into().unwrap();
+            client
+                .send_op_return(&to, amount, request.wtid.as_ref())
+                .unwrap();
+            let timestamp = Timestamp::now();
+            json_response(
+                StatusCode::OK,
+                &TransferResponse {
+                    timestamp,
+                    row_id: SafeUint64::try_from(0).unwrap(),
+                },
+            )
+            .await
+        }
+        "/history/incoming" => {
+            assert_method(&parts, Method::GET)?;
+            let params: HistoryParams =
+                serde_urlencoded::from_str(parts.uri.query().unwrap_or("")).unwrap();
+            let guard = state.incoming.lock().await;
+            let transactions: Vec<IncomingBankTransaction> = guard
+                .iter()
+                .map(|tx| IncomingBankTransaction::IncomingReserveTransaction {
+                    row_id: tx.row_id,
+                    date: tx.date,
+                    amount: tx.amount.clone(),
+                    credit_account: tx.credit_account.clone(),
+                    debit_account: tx.debit_account.clone(),
+                    reserve_pub: tx.reserve_pub.clone(),
+                })
+                .collect();
+            json_response(
+                StatusCode::OK,
+                &IncomingHistory {
+                    incoming_transactions: transactions,
+                },
+            )
+            .await
+        }
+        "/history/outgoing" => {
+            assert_method(&parts, Method::GET)?;
+            let params: HistoryParams =
+                serde_urlencoded::from_str(parts.uri.query().unwrap_or("")).unwrap();
+            let guard = state.outgoing.lock().await;
+            let transactions: Vec<OutgoingBankTransaction> = guard
+                .iter()
+                .map(|tx| OutgoingBankTransaction {
+                    row_id: tx.row_id,
+                    date: tx.date,
+                    amount: tx.amount.clone(),
+                    credit_account: tx.credit_account.clone(),
+                    wtid: tx.wtid.clone(),
+                    debit_account: tx.debit_account.clone(),
+                    exchange_base_url: Url::parse("http://localhost:8080").unwrap(),
+                })
+                .collect();
+            json_response(
+                StatusCode::OK,
+                &OutgoingHistory {
+                    outgoing_transactions: transactions,
+                },
+            )
+            .await
+        }
+        "/admin/add-incoming" => {
+            assert_method(&parts, Method::POST)?;
+            let request: AddIncomingRequest = parse_json(&parts, body).await;
+            let mut guard = state.incoming.lock().await;
+            let row_id = SafeUint64::try_from(guard.len() as u64 + 1).unwrap();
+            let timestamp = Timestamp::now();
+            guard.push(IncomingTransaction {
+                row_id,
+                date: timestamp,
+                amount: request.amount,
+                reserve_pub: request.reserve_pub,
+                debit_account: request.debit_account,
+                credit_account: Url::parse("payto://bitcoin").unwrap(),
+            });
+            json_response(StatusCode::OK, &AddIncomingResponse { timestamp, row_id }).await
+        }
+        _ => return Err((StatusCode::NOT_FOUND, ErrorCode::GENERIC_ENDPOINT_UNKNOWN)),
+    };
+    return Ok(response);
+}