Matt Lockyer mattlockyer

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PRs with comments > Issues; Active on Twitter; Bad response time to TG or LinkedIn DMs.

mattlockyer / nondeterm-ecdsa-recovery.py

Created February 17, 2024 18:58

Produce the same Ethereum address using non-deterministic ECDSA signatures (r,s)

	# references:
	# https://ethereum.stackexchange.com/questions/114680/is-it-possible-to-use-non-deterministic-ecdsa-signatures-schemes-for-signing-eth
	# https://eth-account.readthedocs.io/en/stable/eth_account.html#eth_account.account.Account.recover_message

	from ecdsa import SigningKey, SECP256k1
	from eth_account import Account
	from eth_account.messages import encode_defunct, defunct_hash_message

	message = encode_defunct(text="I♥SF")
	mh = defunct_hash_message(text="I♥SF")

mattlockyer / steps.js

Last active March 12, 2022 22:28

near-cli and near-api-js - key rotation steps for accounts

	// go to https://near.github.io/seed-recovery/ and click the random button at the bottom
	// copy publicKey AND seed phrase somewhere SAFE
	// use the same tool to find the public key of an existing seed phrase OR call
	near keys [accountId]

	// once you have both public keys AND the new seed phrase SAFELY STORED
	near add-key [accountId] [newPublicKey]
	near delete-key [accountId] [oldPublicKey]

	// Reference: https://www.npmjs.com/package/near-cli#near-add-key

mattlockyer / do.ts

Last active December 12, 2021 05:12

Durable Object Generic Boilerplate

	const META_KEY: string = '_M'

	export class Object {
	state: DurableObjectState
	meta: any
	data: any
	timeouts: any

	constructor(state: DurableObjectState, env: Env) {
	this.state = state;

mattlockyer / basics.js

Created June 5, 2021 00:03

NEAR Basics, Connect, Wallet, Account, Call Methods

	// new near instance (for NodeJS use InMemoryKeyStore)

	// do this once somewhere when app "mounts" or loads

	const near = new Near({
	networkId,
	nodeUrl,
	walletUrl,
	deps: {
	keyStore: new keyStores.BrowserLocalStorageKeyStore()

mattlockyer / near-base64.js

Last active April 16, 2023 23:23

NEAR Protocol - matching base64 strings in JS and Rust

	// JS (node - for browser you need to use btoa(String.fromCharCode(...new Uint8Array(...)))

	const hash = sha256.create();
	const hashesBase64 = [
	'some string'
	].map((src) => {
	return Buffer.from(hash.update(src).array()).toString('base64')
	})

mattlockyer / sign-for-user.js

Created April 17, 2021 21:00

NEAR Protocol - Sign TX as another account using an access key added to that account

	import * as nearAPI from 'near-api-js';

	const {
	Account,
	KeyPair,
	} = nearAPI;

	// near is your current near connection instance (somewhere in your app init)

	export const getAccessKeyAccount = (near, accountId, secretKey) => {

mattlockyer / sign-with-near-cli.js

Last active January 21, 2021 05:41

Signing Messages with near-cli

	// set the network (if you want mainnet)
	export NEAR_ENV=mainnet
	// choose 1 or 2
	// 1. NEAR wallet login
	near login
	// 2. LEDGER replace ACCOUNT_ID
	// change useLedgerKey value if you are using custom ledger path
	near repl --accountId="ACCOUNT_ID" --useLedgerKey="44'/397'/0'/0'/1'"

	// REPL

mattlockyer / index.html

Created December 19, 2020 23:18

Image Link Preview Meta Tags

	Use square image or 1200x628

	<head>
	<meta property="og:title" content="">
	<meta property="og:image" content="">
	<meta property="og:type" content="website">
	<meta name="twitter:card" content="summary_large_image">
	<meta name="twitter:site" content="@mattdlockyer">
	<meta name="twitter:creator" content="@mattdlockyer">
	<meta property="twitter:image:alt" content="">

mattlockyer / random.rs

Last active June 2, 2022 17:40

NEAR Random Number (u128)


	// anywhere in your contract

	fn random_u128() -> u128 {
	let random_seed = env::random_seed(); // len 32
	// using first 16 bytes (doesn't affect randomness)
	as_u128(random_seed.get(..16).unwrap())
	}

	fn as_u128(arr: &[u8]) -> u128 {

mattlockyer / console.js

Created October 23, 2020 22:23

Quick Modal for Developer Console

	modal = document.createElement('div')
	modal.innerHTML = '<span id="close-modal">x</span>'
	style = modal.style
	modal.style.zIndex = 1000
	modal.style.width = modal.style.height = '90%'
	modal.style.background = 'white'
	modal.style.position = 'absolute'
	modal.style.top = modal.style.left = '5%'
	modal.style.padding = '16px'
	document.body.appendChild(modal)