Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Added BlockTreeEntry::ancestor to look up an ancestor block at a given height. Returns None if the height is out of range. This operation is O(log N).
Added Transaction::locktime() to retrieve a transaction's nLockTime value as a u32.
Added TxIn::sequence() to retrieve an input's nSequence value as a u32.
Added TryFrom<&[u8]> for BlockHeader to align with the exisitng TryFrom<&[u8]> implementation for Block.
Added BlockHeaderExt::consensus_encode to serialize a block header to its Bitcoin wire format, returning a fixed [u8; 80] array.
Added From<BlockHeader> and From<&BlockHeader> for [u8; 80] to align with existing block conversions.

Added a PrecomputedTransactionData struct for holding transaction hashes required for script verification. It may be initialized with and without an array of outputs spent by the transaction. If no outputs are passed, no taproot verification is possible.
Added a BlockHeader struct for holding block header data. This may be used to retrieve block header struct internals, and to process block headers for the purpose of "headers-first" synchronization. Also add a ChainstateManager method to process block headers, i.e. validate and add them to its internal block tree data structure.

Updated to latest libbitcoinkernel-sys with btck_PrecomputedTransactionData` changes.
The verify function now takes a PrecomputedTransactionData instead of an array of outputs spent by the transaction. The user is now always required to pass this struct to the function. This is done to encourage its use and protect against quadratic hashing costs.