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bitcoin/doc/release-notes-24539.md
sstone 3d82ec5bdd
Add a "tx output spender" index 
Adds an outpoint -> txid index, which can be used to find which transactions spent a given output.
We use a composite key with 2 parts (suggested by @romanz): hash(spent outpoint) and tx position, with an empty value.
To find the spending tx for a given outpoint, we do a prefix search (prefix being the hash of the provided outpoint), and for all keys that match this prefix
we load the tx at the position specified in the key and return it, along with the block hash, if does spend the provided outpoint.
To handle reorgs we just erase the keys computed from the removed block.

This index is extremely useful for Lightning and more generally for layer-2 protocols that rely on chains of unpublished transactions.
If enabled, this index will be used by `gettxspendingprevout` when it does not find a spending transaction in the mempool.
2026-02-19 11:41:53 +01:00

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New settings

  • -txospenderindex enables the creation of a transaction output spender index that, if present, will be scanned by gettxspendingprevout if a spending transaction was not found in the mempool. (#24539)

Updated RPCs

  • gettxspendingprevout has 2 new optional arguments: mempool_only and return_spending_tx. If mempool_only is true it will limit scans to the mempool even if txospenderindex is available. If return_spending_tx is true, the full spending tx will be returned. In addition if txospenderindex is available and a confirmed spending transaction is found, its block hash will be returned. (#24539)