mr-zwets / authupdate

JS program to update BCMR metadata on-chain

AuthUpdate

A handy Javascript program to update your BCMR metadata on-chain!

What it is

A program to import a single-address wallet for creating an OP_RETURN output in the authchain to publish a BCMR metadata update for a token or identity.

Disclaimer

Be careful with any program asking you to fill in your seedphrase! Verify the source of the program and that is doing what it claims to be doing!

How to use it

Before starting, it is expected that you hold the AuthHead in either a dedicated wallet used for no other purpose or a wallet with coin-control to prevent accidental burning.

Clone this repo locally & have Node-js installed to run javascript programs. Install the npm dependency (mainnet-js) in the command line with

npm install

Next, fill in the 5 variables at the top of the authUpdate.js file

• the tokenId (or authbase)
• either the bcmrURL or the bcmrIpfsCID
• the seedphase
• the derivationPathAddress
• keepReservedSupply boolean

For the derivationPathAddress: if your authHead is at address index 4 in your Electron Cash, change m/44'/145'/0'/0/0 to m/44'/145'/0'/0/4.

Finally run the program from the command line with

node authUpdate.js

to broadcast the onchain metadata update. To use this program you need enough BCH in the single-address wallet to cover the network fees of the transaction.

How it works

The program imports a one-address wallet from the provided seedphrase and creates a transaction to publish an on-chain BCMR update in the authchain. More specifically, it sends the authhead back to the same address and has an OP_RETURN as second output to put data for the BCMR update on-chain according to the BCMR spec:

OP_RETURN <'BCMR'> <hash> <uri>