💎 BC-UR Dart

English | 繁體中文

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🌏 English

Overview

A premium, high-performance pure Dart implementation of the BC-UR (Blockchain Commons Uniform Resources) specification.

This library provides 100% byte-for-byte algorithmic parity with the official C++ reference implementation, ensuring flawless interoperability with professional hardware wallets like Keystone and Passport.

🚀 Key Features

• ✅ 100% C++ Reference Compliant – Perfect parity with official test vectors.
• ✅ Robust Peeling Decoder – Advanced Gaussian-elimination recovery logic.
• ✅ Fountain Code Engine – Native Luby transform implementation for air-gapped data.
• ✅ Pure Dart – Zero Flutter dependencies. Runs on Server, CLI, and Mobile.
• ✅ Specification Standards – Full support for CBOR (RFC 8949) and Bytewords.

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🇹🇼 繁體中文

概覽

這是一個專為 Dart 生態系開發的 BC-UR (Blockchain Commons Uniform Resources) 協議高階實作。

本函式庫與官方 C++ 參考實作完全一致，達到 100% 位元級對等，確保與 Keystone 和 Passport 等專業硬體錢包之間的無縫互操作性。

🚀 核心特性

• ✅ 100% C++ 兼容 – 通過官方完整測試套件驗證。
• ✅ 強健的解碼引擎 – 採用高性能「剝離解碼」演算法，輕鬆還原多部分數據。
• ✅ 噴泉碼技術 – 原生實作離網 (Air-gapped) 數據傳輸專用的噴泉碼。
• ✅ 純 Dart 實作 – 無任何 Flutter 依賴，可用於後端、CLI 或行動端。
• ✅ 標準化支援 – 嚴格遵循 CBOR (RFC 8949) 與 Bytewords 規範。

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📊 Architecture / 技術架構

Data Flow / 數據流

graph LR
    Data["📦 Data"] --> CBOR["🧬 CBOR"]
    CBOR --> Fountain["⛲ Fountain"]
    Fountain --> Bytewords["📝 Bytewords"]
    Bytewords --> UR["📱 UR String"]
    UR --> Decoder["🧩 Decoder"]
    Decoder --> Recovered["🧬 CBOR"]
    Recovered --> Result["📦 Data"]
    
    style Data fill:#f9f,stroke:#333,stroke-width:2px
    style UR fill:#bbf,stroke:#333,stroke-width:2px
    style Result fill:#f9f,stroke:#333,stroke-width:2px

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📦 Installation / 安裝

dependencies:
  bc_ur:
    git:
      url: https://github.com/ImL1s/bc-ur-dart.git

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🛠 Quick Start / 快速上手

Single Part / 單部分

final ur = BCUR.fromData('crypto-request', {'address': 'bc1q...', 'amount': 1000000});
print(ur.toString()); // ur:crypto-request/...

Multipart (Animated QR) / 多部分 (動態 QR)

// Encoder / 編碼
final encoder = BCURFountainEncoder(largeUR, maxFragmentLength: 100);
final part = encoder.nextPart();

// Decoder / 解碼
final decoder = BCURFountainDecoder();
decoder.receivePart(scannedPart);
if (decoder.isComplete) {
  print(decoder.getResult());
}

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🛡 Verification / 驗證

dart test

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📄 License / 授權

MIT License. Built by ImL1s @ Blockchain Commons specs.