btcdeb.wasm — Bitcoin Script debugger

load spend

transaction id input index (vin)

Pulls the transaction and every prevout it spends from mempool.space, then resolves the spend type.

raw transaction hex input index (vin)

Prevouts are looked up on mempool.space by the inputs' outpoints, so unbroadcast transactions work too — as long as they spend confirmed outputs.

script (asm or hex) initial stack (hex, top last) sigversion

No transaction, so signature checks cannot build a real sighash. Enable assume valid signatures below to step past them.

assume valid signatures

sources width 290px machine width 340px console height 190px

The dividers between panels drag too — double-click one to put that panel back to its default.

no spend loaded

Load a transaction, or pick an example, to begin stepping.

idle

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