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blockchain

This is a naive and native Rust blockchain protocol implementation, very much WIP. From this experiment will eventually emerge a series of articles on the principles of distributed consensus, and a step-by-step implementation of a blockchain protocol in Rust.

General design

The node crate is the entry point: it sets up a TCP server for node-to-node communication, parsing protocol messages in the MessagePack format. A protocol message has the following structure:

| MAGIC ("BLOCK") | PROTOCOL VERSION (32B) | MSG TYPE (32B) | MSG PAYLOAD (32B) | PAYLOAD |

While TCP is fine for broadcasting transactions, blocks, and other technical stuff, users need a more human-friendly channel of communication witht their local node in order to start transactions, check blockchain status, etc. This implementation aims at providing a JSON-RPC server through HTTP (very much a la Bitcoin).

The jsonrpc crate provides data structures that model the JSON-RPC protocol model (V2.0).

The merkle crate provides for now a simple immutable binary tree implementation. It aims at providing a sensible Merkle-tree implementation, which I expect will warrant its separate post (implementing data structures in Rust is interesting to say the least).

Cryptography

The fantastic ed_25519 library is used for public-key cryptography. For hashing purposes, we rely on Sha2. Common sense dictates that "ye shall base58-encode addresses, lest thine offspring be lost".

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An experimental pure-Rust blockchain implementation.

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