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diff --git a/packages/anastasis-core/src/provider-types.ts b/packages/anastasis-core/src/provider-types.ts
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+++ b/packages/anastasis-core/src/provider-types.ts
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+import { AmountString } from "@gnu-taler/taler-util";
+
+export interface EscrowConfigurationResponse {
+  // Protocol identifier, clarifies that this is an Anastasis provider.
+  name: "anastasis";
+
+  // libtool-style representation of the Exchange protocol version, see
+  // https://www.gnu.org/software/libtool/manual/html_node/Versioning.html#Versioning
+  // The format is "current:revision:age".
+  version: string;
+
+  // Currency in which this provider processes payments.
+  currency: string;
+
+  // Supported authorization methods.
+  methods: AuthorizationMethodConfig[];
+
+  // Maximum policy upload size supported.
+  storage_limit_in_megabytes: number;
+
+  // Payment required to maintain an account to store policy documents for a year.
+  // Users can pay more, in which case the storage time will go up proportionally.
+  annual_fee: AmountString;
+
+  // Payment required to upload truth.  To be paid per upload.
+  truth_upload_fee: AmountString;
+
+  // Limit on the liability that the provider is offering with
+  // respect to the services provided.
+  liability_limit: AmountString;
+
+  // Salt value with 128 bits of entropy.
+  // Different providers
+  // will use different high-entropy salt values. The resulting
+  // **provider salt** is then used in various operations to ensure
+  // cryptographic operations differ by provider.  A provider must
+  // never change its salt value.
+  server_salt: string;
+
+  business_name: string;
+}
+
+export interface AuthorizationMethodConfig {
+  // Name of the authorization method.
+  type: string;
+
+  // Fee for accessing key share using this method.
+  cost: AmountString;
+}
+
+export interface TruthUploadRequest {
+  // Contains the information of an interface EncryptedKeyShare, but simply
+  // as one binary block (in Crockford Base32 encoding for JSON).
+  key_share_data: string;
+
+  // Key share method, i.e. "security question", "SMS", "e-mail", ...
+  type: string;
+
+  // Variable-size truth. After decryption,
+  // this contains the ground truth, i.e. H(challenge answer),
+  // phone number, e-mail address, picture, fingerprint, ...
+  // **base32 encoded**.
+  //
+  // The nonce of the HKDF for this encryption must include the
+  // string "ECT".
+  encrypted_truth: string; //bytearray
+
+  // MIME type of truth, i.e. text/ascii, image/jpeg, etc.
+  truth_mime?: string;
+
+  // For how many years from now would the client like us to
+  // store the truth?
+  storage_duration_years: number;
+}