3id-blockchain-utils

This package contains a bunch of utilities that is used by 3ID and 3Box in order to create and verify links from blockchain addresses.

Tabel of Contents

• Install
• Usage
• Supported blockchains
• Contributing
  • Test
• License

Install

$ npm install --save 3id-blockchain-utils

Usage

Import the package into your project

import { createLink, validateLink, authenticate } from '3id-blockchain-utils'

Use the library to create and verify links:

const did = 'did:3:bafypwg9834gf...'
const proof = await createLink(did, '0x123abc...', ethereumProvider)
console.log(proof)

const verified = await validateLink(proof)
if (verified) {
  console.log('Proof is valid', proof)
} else {
  console.log('Proof is invalid')
}

Use the library for 3ID authenticate:

await authenticate(message, '0x123abc...', ethereumProvider)

Supported blockchains

Below you can see a table which lists supported blockchains and their provider objects.

Blockchain	CAIP-2 namespace	Supported providers
Ethereum	eip155	metamask-like ethereum provider
Filecoin	fil	Filecoin Wallet Provider

Maintainers

@oed

Adding support for a blockchain

If you want to add support for a new blockchain to 3ID this is the place to do so. This library uses CAIP-10 to represent accounts in a blockchain agnostic way. If the blockchain you want to add isn't already part of the CAIP standards you shold make sure to add it there.

To begin adding support for a given blockchain add a file with the path: src/blockchains/<blockchain-name>.js. This module needs to export three functions:

• createLink - creates a LinkProof object which associates the specified AccountID with the DID
• validateLink - validates the given LinkProof
• authenticate - signs a message and returns some entropy based on the signature. Needs to be deterministic

It also needs to export a constant called namespace. This constant is a string which contains the CAIP-2 chainId namespace.

Please see src/blockchains/ethereum.js for an example of how this is implemented for the eip155 (ethereum) CAIP-2 namespace.

Finally add support for your blockchain in src/index.js. Simply add it to the handlers array.

Test

Test the code by running:

$ npm test

Licence

Apache-2.0 OR MIT