Bitcoin sends use nLockTime = 0 (anti-fee-sniping + payjoin fingerprint)

[bc1cindy]

Cake sets nLockTime = 0 on all BTC txs; Core/Electrum use tip + ~10% backdate, so no anti-fee-sniping, and payjoins diverge from other impls

Locktime is never set, defaulting to 0 in two paths, a wallet-wide fix must touch both:

• BitcoinTransactionBuilder (bitcoin_base) (Add locktime param to BitcoinTransactionBuilder bitcoin_base#13)
• PSBTTransactionBuild/PsbtV2 (no setGlobalFallbackLocktime) → payjoin originalPsbt.

proposal: replicate Core (tip; 10% max(0, tip-rand(0..99)); 0 if unsynced) via a shared helper, passed into both builders.

ref: payjoin/rust-payjoin#1676

[bc1cindy]

@bc1cindy Have you been able to resolve this issue?

yes, opened PRs are linked