feat(wasm-utxo): add support for utxolib signature size compatibility#98
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OttoAllmendinger merged 1 commit intomasterfrom Jan 14, 2026
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feat(wasm-utxo): add support for utxolib signature size compatibility#98OttoAllmendinger merged 1 commit intomasterfrom
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Adds compatibility mode to make input size estimates match @bitgo/unspents. This allows wasm-utxo to produce the same transaction size estimates as utxo-lib when needed, while still supporting accurate min/max bounds. The key change is using 72-byte signatures for ECDSA inputs in compat mode instead of 73-byte for the max calculation, which matches @bitgo/unspents behavior. The implementation also replicates specific encoding choices used in utxo-lib. Issue: BTC-2908 Co-authored-by: llm-git <llm-git@ttll.de>
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davidkaplanbitgo
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Add utxolibCompat option to Dimensions to match @bitgo/unspents vSize
calculations. This allows exact fee estimation compatibility with the
legacy library by using 72-byte signatures instead of 73-byte max.
The implementation handles encoding differences like OP_PUSHDATA2 for
redeemScripts, which affects weight calculations and virtual sizes.
BTC-2908