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Add wallet #59

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Aug 12, 2021
Merged

Add wallet #59

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11 changes: 11 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -7,6 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Added

- Wallet which allows users to select coins through a backend configured by them via the `GetUtxos` trait.
The provided wallet comes with a UTXO cache which this is updated using `Wallet::sync`.
This allows users of the library to optimise the number of requests to their backend.
Users can also sign said UTXOs by calling `Wallet::sign`.

### Changed

- The borrower can now choose the collateral inputs before calling `Borrower0::new`.

### Fixed

- The loan transaction no longer expects collateral and principal change outputs.
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12 changes: 11 additions & 1 deletion Cargo.toml
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Expand Up @@ -10,19 +10,29 @@ license-file = "LICENSE"
description = "Library to facilitate DeFi on Liquid"

[dependencies]
aes-gcm-siv = { version = "0.9", features = ["std"] }
anyhow = "1"
async-trait = "0.1"
bdk = { version = "0.4", default-features = false }
bip32 = { version = "0.2", features = ["secp256k1-ffi", "bip39"], default-features = false }
conquer-once = "0.3"
elements = { version = "0.18", features = ["serde-feature"] }
elements-miniscript = { version = "0.1", features = ["use-serde"] }
futures = "0.3"
hex = "0.4"
hkdf = { version = "0.10", features = ["std"] }
itertools = "0.10"
log = "0.4"
rand = "0.6"
rand = { version = "0.6", features = ["wasm-bindgen"] }
reqwest = { version = "0.11", default-features = false, features = ["rustls", "json"] }
rust_decimal = "1"
serde = { version = "1", features = ["derive"] }
sha2 = "0.9"
thiserror = "1"

[dev-dependencies]
elements-consensus = { git = "https://github.com/comit-network/rust-elements-consensus", rev = "ac88dbedcd019eef44f58499417dcdbeda994b0b" }
link-cplusplus = "1"
rand_chacha = "0.1"
serde_json = "1"
tokio = { version = "1", default-features = false, features = ["macros", "rt"] }
17 changes: 17 additions & 0 deletions src/avg_vbytes.rs
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@@ -0,0 +1,17 @@
//! These constants have been reverse engineered through the following transactions:
//!
//! https://blockstream.info/liquid/tx/a17f4063b3a5fdf46a7012c82390a337e9a0f921933dccfb8a40241b828702f2
//! https://blockstream.info/liquid/tx/d12ff4e851816908810c7abc839dd5da2c54ad24b4b52800187bee47df96dd5c
//! https://blockstream.info/liquid/tx/47e60a3bc5beed45a2cf9fb7a8d8969bab4121df98b0034fb0d44f6ed2d60c7d
//!
//! This gives us the following set of linear equations:
//!
//! - 1 in, 1 out, 1 fee = 1332
//! - 1 in, 2 out, 1 fee = 2516
//! - 2 in, 2 out, 1 fee = 2623
//!
//! Which we can solve using wolfram alpha: https://www.wolframalpha.com/input/?i=1x+%2B+1y+%2B+1z+%3D+1332%2C+1x+%2B+2y+%2B+1z+%3D+2516%2C+2x+%2B+2y+%2B+1z+%3D+2623
//!
pub const INPUT: u64 = 107;
pub const OUTPUT: u64 = 1184;
pub const FEE: u64 = 41;
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