feat(electrum): add blockchain.scripthash.get_mempool#226
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EddieHouston merged 1 commit intoJul 1, 2026
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…lectrs
Implement the get_mempool method from the Electrum 1.4 protocol (which
electrs already advertises). Returns a script hash's unconfirmed history
as {tx_hash, height, fee}, with height 0 when all inputs are confirmed
and -1 when there are unconfirmed parents. Mempool-only lookup, reusing
the get_history txs_limit / TooPopular guard.
Closes Blockstream#120
This was referenced Jun 17, 2026
Randy808
approved these changes
Jun 25, 2026
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Summary
Implements
blockchain.scripthash.get_mempool, part of the Electrum protocol (a method that has existed since 1.1; electrs advertises 1.4). Previously a client calling this method received an unknown-method error (EOF), which is confusing given the advertised protocol version.The new handler returns the unconfirmed history of a script hash as a list of
{tx_hash, height, fee}, where:heightis0when all of the transaction's inputs are confirmed, andheightis-1when the transaction has unconfirmed parents,per the spec. It performs a mempool-only lookup and enforces the same
txs_limit/TooPopularguard already used byget_history, reusing the existingGetHistoryResultserialization sofeeis included.On ordering: at protocol 1.4 the result order is undefined, so this returns results in mempool order. Protocol 1.6 tightens this to a canonical
(-height, tx_hash)order; that's tracked with the broader 1.6 work in #172.Test plan
Adds
test_electrum_scripthash_get_mempool(tests/electrum.rs), which verifies:height: 0and a presentfeeafter an unconfirmed funding tx, andCloses #120