Struct CompactBlock 

pub struct CompactBlock {
    pub header: BlockHeader,
    pub nonce: u64,
    pub short_ids: Vec<ShortTxId>,
    pub prefilled_txs: Vec<PrefilledTransaction>,
}

A compact block (BIP152 cmpctblock).

Contains the header, a nonce, short transaction IDs for most transactions, and a few prefilled transactions (always at least the coinbase).

Fields

header: BlockHeader

The block header.

nonce: u64

Random nonce used for short ID computation.

short_ids: Vec<ShortTxId>

Short transaction IDs for non-prefilled transactions.

prefilled_txs: Vec<PrefilledTransaction>

Prefilled transactions (coinbase + any extras).

Implementations

impl CompactBlock

pub fn from_block(block: &Block, nonce: u64) -> Self

Build a compact block from a full block.

The coinbase transaction is always prefilled. Additional transactions may be prefilled if the sender thinks the receiver won’t have them.

pub fn reconstruct( &self, mempool_lookup: &HashMap<ShortTxId, Transaction>, ) -> ReconstructResult

Attempt to reconstruct the full block using a mempool lookup.

mempool_lookup maps short IDs → transactions. If all transactions can be resolved, returns the full block. Otherwise, returns a request for the missing transactions.

pub fn transaction_count(&self) -> usize

The number of transactions represented (prefilled + short IDs).

pub fn build_mempool_lookup<'a, I>( &self, mempool_txs: I, ) -> HashMap<ShortTxId, Transaction>

where I: IntoIterator<Item = &'a Transaction>,

Build a mempool lookup table for compact block reconstruction.

Takes an iterator of mempool transactions and returns a map from short ID → transaction, keyed using this compact block’s header and nonce.

Trait Implementations

impl Clone for CompactBlock

fn clone(&self) -> CompactBlock

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CompactBlock

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.