chore: bump chain-fusion-signer to v0.4.0#288
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BTC sign/send fees now scale per UTXO input (one sign_with_ecdsa per input): btc_caller_sign is 74B + N×37B cycles, btc_caller_send is 95B + N×37B cycles. Update the API fees table and add an explanation of the per-input pricing model.
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should not be merged until the CFS is updated on mainnet |
raymondk
approved these changes
Jun 9, 2026
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Summary
.sources/chain-fusion-signerfrom v0.3.0 (8cea727) to v0.4.0 (a18c52a).sources/VERSIONSdocs/guides/chain-fusion/chain-fusion-signer.mdWhat changed in v0.4.0
The key functional change is per-input BTC fee pricing (PR #512):
btc_caller_sign: was flat 132B cycles → now74B + (n_inputs × 37B)cyclesbtc_caller_send: was flat 132B cycles → now95B + (n_inputs × 37B)cyclesEach BTC input requires one
sign_with_ecdsacall, so fees now scale with the number of UTXOs spent. The old flat fee was inaccurate and inconsistent with the rest ofSignerMethods.fee()returns a grace-period default sized for 2 inputs (148B / 169B) for backward compatibility. Callers with more than 2 inputs should usebtc_fee_for_inputs(n).All other method fees are unchanged.
Docs changes
All other checked pages (
concepts/chain-fusion/,guides/chain-fusion/bitcoin.mdx, etc.) contain no hardcoded BTC fee values — no further changes needed.