I want to know if a regtest nnode can sign a raw mainnet transaction with the signrawtransactionwithkey rpc provided that I pass the correct keys and prevtxs as the regtest node will not be aware of them?

1 Answer 1


No, you will get an Invalid private key error. Note that if you use a correct-network private key but it is the wrong key to sign the input you provide you get a different error: Unable to sign input, invalid stack size (possibly missing key)

The base58 prefix is checked against a constant value that is different for each network (main, regtest, etc)

const std::vector<unsigned char>& privkey_prefix =


  • If I was to set the -pubkeyprefix and -secretprefix to the same values as mainnet would that work?
    – Harmalarm
    Jun 25, 2020 at 20:32
  • 1
    Hm are those actual command line parameters? I don't see those terms grepping the codebase. What do you mean?
    – pinhead
    Jun 25, 2020 at 21:14
  • Oh, you are correct those are daemon options for Elements Project. With Elements you can set those params.
    – Harmalarm
    Jun 25, 2020 at 22:32
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    I see. Cool. Ya know, you don't need a full node to sign a TX if you have all that data. There's libraries and toolkits written in other languages etc that might suit you better
    – pinhead
    Jun 25, 2020 at 22:33
  • Ya, I have been using NBitcoin but it can't sign Elements transactions for some reason.
    – Harmalarm
    Jun 25, 2020 at 23:14

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