# Bitcoin Block Header Package

A Rust library for working with Bitcoin block headers.

## Overview

This package provides functionality for working with Bitcoin block headers, following the standard Bitcoin protocol specification.

## Block Header Structure

A Bitcoin block header consists of 80 bytes containing:

- Version (4 bytes): Block version indicating the set of block validation rules to follow
- Previous Block Hash (32 bytes): Double SHA256 hash of the previous block's header
- Merkle Root (32 bytes): Hash of the root of the merkle tree of transactions
- Timestamp (4 bytes): Current timestamp as seconds since Unix epoch
- Difficulty Target/Bits (4 bytes): Compact format of the current difficulty target
- Nonce (4 bytes): Counter used for Proof of Work mining

## Installation

Add this to your `Cargo.toml`:

```toml
[dependencies]
block_header = { version = "0.1.0", path = "utxo_detective_block_header" }
```

## Basic Usage

```rust
use block_header::BlockHeader;

// Create a block header from raw bytes
let header_bytes: [u8; 80] = [/* ... */];
let header = BlockHeader::new(&header_bytes)?;

// Access header data
let version = header.version();
let prev_block = header.prev_blockhash();
let prev_block_hex = header.prev_blockhash_hex();
let merkle_root = header.merkle_root();
let merkle_root_hex = header.merkle_root_hex();
let timestamp = header.time();
let bits = header.bits();
let bits_hex = header.bits_hex();
let nonce = header.nonce();

// Calculate and access the block hash
let blockhash = header.blockhash();
let blockhash_hex = header.blockhash_hex();
```

## Features

- Parse Bitcoin block headers from raw bytes
- Access standard block header fields
- Serialize block headers back to bytes
- Basic validation of header structure

## License

This project is licensed under the MIT License.