Class

BlockSpentOutputs

The spent-output (undo) data for every transaction in a block — the collection of UTXOs that this block’s transactions consumed.

final class BlockSpentOutputs

Overview

Spent outputs are what the kernel writes to rev*.dat files alongside blk*.dat so it can undo a block during a chain reorganization. Obtain via readBlockSpentOutputs(at:); genesis blocks have no undo data and the read returns nil there.

The index aligns with the block’s transaction list, except that the coinbase (always index 0 in the block) contributes no spent outputs.

Wraps the opaque btck_BlockSpentOutputs type; deinit calls btck_block_spent_outputs_destroy when the last Swift reference drops.

Topics

Instance Properties

var count: Int
The number of transactions in this block whose inputs are recorded here — equals the block’s non-coinbase transaction count.

Instance Methods

func transactionSpentOutputs(at: Int) -> TransactionSpentOutputs
Returns the spent outputs for the transaction at the given index as an owned TransactionSpentOutputs (safe to store past this block’s lifetime).