Proven library for signing a multi chain transaction

Question

Thanks for that......makes sense.  On a related topic, have you tested any of the bitcoin libraries to sign a multi chain raw transaction.  We are currently using bitcoin.js as we use that for BTC, and so far we just haven't been able to get it to successfully sign a transaction??

If you have any examples using external libraries, that would be very helpful!!

 

Cheers

 

Marty

Answer 1

We don't have a worked example of this yet, but we know other people have done it.

In general with any library the two main things to look out for are:

1. Pass address and private key parameters to the library in a format it expects. To make life easy to start with, you can use bitcoin-compatible addresses and private keys in MultiChain using the blockchain parameters given on this page: https://www.multichain.com/developers/address-key-format/
2. Step through the library code for signing transactions and bypass any checks it may contain regarding the content of transaction outputs. MultiChain uses both OP_DROP and OP_RETURN metadata extensively to extend the bitcoin protocol, in ways that don't appear in standard bitcoin transactions.

Hope this helps and we'd love to hear how you get on.

Answer 2

MultiChain 1.0.1 released today include a cold node/wallet that can be used for signing transactions. More information here: https://www.multichain.com/developers/cold-nodes-wallets/