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diff --git a/packages/taler-wallet-core/src/crypto/cryptoTypes.ts b/packages/taler-wallet-core/src/crypto/cryptoTypes.ts
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+/*
+ This file is part of GNU Taler
+ (C) 2020 Taler Systems SA
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Types used by the wallet crypto worker.
+ *
+ * These types are defined in a separate file make tree shaking easier, since
+ * some components use these types (via RPC) but do not depend on the wallet
+ * code directly.
+ *
+ * @author Florian Dold <dold@taler.net>
+ */
+
+/**
+ * Imports.
+ */
+import { AmountJson } from "@gnu-taler/taler-util";
+
+export interface RefreshNewDenomInfo {
+  count: number;
+  value: AmountJson;
+  feeWithdraw: AmountJson;
+  denomPub: string;
+}
+
+/**
+ * Request to derive a refresh session from the refresh session
+ * secret seed.
+ */
+export interface DeriveRefreshSessionRequest {
+  sessionSecretSeed: string;
+  kappa: number;
+  meltCoinPub: string;
+  meltCoinPriv: string;
+  meltCoinDenomPubHash: string;
+  newCoinDenoms: RefreshNewDenomInfo[];
+  feeRefresh: AmountJson;
+}
+
+/**
+ *
+ */
+export interface DerivedRefreshSession {
+  /**
+   * Public key that's being melted in this session.
+   */
+  meltCoinPub: string;
+
+  /**
+   * Signature to confirm the melting.
+   */
+  confirmSig: string;
+
+  /**
+   * Planchets for each cut-and-choose instance.
+   */
+  planchetsForGammas: {
+    /**
+     * Public key for the coin.
+     */
+    publicKey: string;
+
+    /**
+     * Private key for the coin.
+     */
+    privateKey: string;
+
+    /**
+     * Blinded public key.
+     */
+    coinEv: string;
+
+    /**
+     * Hash of the blinded public key.
+     */
+    coinEvHash: string;
+
+    /**
+     * Blinding key used.
+     */
+    blindingKey: string;
+  }[][];
+
+  /**
+   * The transfer keys, kappa of them.
+   */
+  transferPubs: string[];
+
+  /**
+   * Private keys for the transfer public keys.
+   */
+  transferPrivs: string[];
+
+  /**
+   * Hash of the session.
+   */
+  hash: string;
+
+  /**
+   * Exact value that is being melted.
+   */
+  meltValueWithFee: AmountJson;
+}
+
+export interface DeriveTipRequest {
+  secretSeed: string;
+  denomPub: string;
+  planchetIndex: number;
+}
+
+/**
+ * Tipping planchet stored in the database.
+ */
+export interface DerivedTipPlanchet {
+  blindingKey: string;
+  coinEv: string;
+  coinEvHash: string;
+  coinPriv: string;
+  coinPub: string;
+}
+
+export interface SignTrackTransactionRequest {
+  contractTermsHash: string;
+  wireHash: string;
+  coinPub: string;
+  merchantPriv: string;
+  merchantPub: string;
+}