Implementing proof of reserves

.github/workflows/cont_integration.yml

@@ -24,6 +24,7 @@ jobs:
           - compiler
           - rpc
           - verify
+          - reserves
     steps:
       - name: checkout
         uses: actions/checkout@v2

.gitignore

@@ -3,3 +3,5 @@ Cargo.lock
 
 *.swp
 .idea
+
+.vscode/

CHANGELOG.md

@@ -21,6 +21,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added Bitcoin core RPC added as blockchain backend
 - Added a `verify` feature that can be enable to verify the unconfirmed txs we download against the consensus rules
 
+### Proof of reserves
+- Added a separate module to construct "proof of reserve" PSBTs, and verify them.
+
 ## [v0.8.0] - [v0.7.0]
 
 ### Wallet

Cargo.toml

@@ -33,6 +33,7 @@ lazy_static = { version = "1.4", optional = true }
 tiny-bip39 = { version = "^0.8", optional = true }
 zeroize = { version = "<1.4.0", optional = true }
 bitcoinconsensus = { version = "0.19.0-3", optional = true }
+base64 = { version = "^0.13", optional = true }
 
 # Needed by bdk_blockchain_tests macro
 bitcoincore-rpc = { version = "0.13", optional = true }
@@ -59,7 +60,7 @@ async-interface = ["async-trait"]
 all-keys = ["keys-bip39"]
 keys-bip39 = ["tiny-bip39", "zeroize"]
 rpc = ["bitcoincore-rpc"]
-
+reserves = ["bitcoinconsensus", "base64", "electrum"]
 
 # Debug/Test features
 test-blockchains = ["bitcoincore-rpc", "electrum-client"]
@@ -73,6 +74,7 @@ lazy_static = "1.4"
 env_logger = "0.7"
 clap = "2.33"
 electrsd = { version= "0.6", features = ["trigger", "bitcoind_0_21_1"] }
+rstest = "^0.10"
 
 [[example]]
 name = "address_validator"

src/error.rs

@@ -63,6 +63,9 @@ pub enum Error {
     },
     /// Node doesn't have data to estimate a fee rate
     FeeRateUnavailable,
+    /// Proof error
+    #[cfg(feature = "reserves")]
+    Proof(crate::wallet::reserves::ProofError),
     /// In order to use the [`TxBuilder::add_global_xpubs`] option every extended
     /// key in the descriptor must either be a master key itself (having depth = 0) or have an
     /// explicit origin provided

src/wallet/mod.rs

@@ -38,6 +38,8 @@ use log::{debug, error, info, trace};
 pub mod address_validator;
 pub mod coin_selection;
 pub mod export;
+#[cfg(feature = "reserves")]
+pub mod reserves;
 pub mod signer;
 pub mod time;
 pub mod tx_builder;