How to get input hex for --txin= ? about btcdeb HOT 5 CLOSED

If tx is spending multiple inputs in txin, you have to select the input index you want to look at using the -s (--select) flag. Otherwise btcdeb will derive the first input being spent and pick that.

from btcdeb.

Some explorers allow you to see the raw hex value of a transaction, rather than seeing its "decoded" form.

Bitcoin-cli has a getrawtransaction command which lets you do this as well. If you know the block hash as well, you can use this to get the transaction hex value by doing

bitcoin-cli getrawtransaction <TXIN TXID> <TXIN CONTAINED BLOCK HASH>

from btcdeb.

Some explorers allow you to see the raw hex value of a transaction, rather than seeing its "decoded" form.

Bitcoin-cli has a getrawtransaction command which lets you do this as well. If you know the block hash as well, you can use this to get the transaction hex value by doing

bitcoin-cli getrawtransaction <TXIN TXID> <TXIN CONTAINED BLOCK HASH>

Thanks, my confusion was that --txin=<reftx hex> is the hex of the entire referenced transaction, that the input is referencing. Perhaps it should be clarified in btcdeb.md, it was unclear.

I still do not understand, if the --tx=<hex> has more than one input that reference the same --txin=<reftx hex>, which tx's input script btcdeb is going to debug?

from btcdeb.

Perhaps it's worth adding an example with all three --tx=<hex> --txin=<hex> --select=<input no> into btcdeb.md. I can look for a representative transaction and submit a PR, if you think it's useful. I also did a screen grab illustrating how btcdeb works for a non-trivial script.

Another question:

A script verification (most often) involves verification of (pubKey, signature) pairs, given the sighash. Is there an API to btcdeb that allows to return all (pubKey, signature) pairs, that have been successfully verified for a given input script (regardless of the script logic)?
Or, in the absence of a btcdeb API, perhaps linking to Bitcoin Core libraries and calling its C++ functions is a way to get the verified (pubKey, signature) pairs, given tx, txin and the input number?

This is the screenshot from btcdeb of what I am looking for:

from btcdeb.

Perhaps it's worth adding an example with all three --tx=<hex> --txin=<hex> --select=<input no> into btcdeb.md. I can look for a representative transaction and submit a PR, if you think it's useful. I also did a screen grab illustrating how btcdeb works for a non-trivial script.

Yeah, sounds like a good thing to have.

Another question:

A script verification (most often) involves verification of (pubKey, signature) pairs, given the sighash. Is there an API to btcdeb that allows to return all (pubKey, signature) pairs, that have been successfully verified for a given input script (regardless of the script logic)? Or, in the absence of a btcdeb API, perhaps linking to Bitcoin Core libraries and calling its C++ functions is a way to get the verified (pubKey, signature) pairs, given tx, txin and the input number?

This is the screenshot from btcdeb of what I am looking for:

Nope, no such functionality at the moment.

from btcdeb.