furszy 56cf27db4d wallet: Store all witness variants of a transaction ...

A transaction can have several valid witnesses that share its txid but
differ in wtxid, e.g. when a taproot output is spent via the key path
in one variant and the script path in another.

CWalletTx now keeps all of them in a map indexed by wtxid (m_txs) and
marks one as canonical (m_canonical_wtxid): a confirmed variant if there
is one, otherwise the one with a witness and the lowest weight. GetTx()
and serialization return the canonical variant, so existing callers
don't need to change.

The other variants are stored in their own wtxvariant records keyed by
(txid, wtxid) and merged back into the CWalletTx at load. The tx record
keeps its old format, holding the canonical transaction, so older soft
versions can still read and rewrite it without dropping those records.

2026-07-16 10:56:37 -07:00

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