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export async function tryGetRevertReason(to: string, from: string, data: string): Promise<string | undefined> {
  const provider = ethers.getDefaultProvider();
  const tx = { to, from, data };
  try {
    await provider.estimateGas(tx);
  } catch {
    const value = await provider.call(tx);
    return hexDataLength(value) % 32 === 4 && hexDataSlice(value, 0, 4) === '0x08c379a0'
      ? defaultAbiCoder.decode(['string'], hexDataSlice(value, 4))
      : undefined;

spalladino

How to bypass BitGo's error when using a Ledger wallet

BitGo recently updated the version of its bitcoinjs-lib dependency, but failed to update the code that interacted with legacy wallets that relied on Ledger hardware wallets. This triggered a r.bufferutils.varIntSize is not a function error whenever trying to use the funds in the wallet. Following is a workaround you can use to manually patch the error, and get your funds out of BitGo.

Disclaimer: I set up this workaround to help a friend rescue their funds. I have no idea if it works for every instance of this error, and it may lead to loss of funds. I strongly suggest that you try it out with a small amount before you attempt to remove all your bitcoin from BitGo.

The problem

The problem seems to happen when interacting with a legacy wallet managed by a Ledger hardware wallet. You have a legacy wallet if BitGo displays the following notice when you open your wallet (fun fact: the link to the instructions to mi

spalladino

import csv
import os
import sys

from os.path import isfile
from datetime import date, timedelta
from subprocess import call, check_output

# Script expects that each project is in a folder with the same name in the working directory
PROJECTS = ['my-project', 'another-project']

spalladino

Manual setup for a GSN relayer

⚠️ This setup is only good for GSNv1. Head over to https://docs.opengsn.org for the latest setup for GSNv2.

Install nginx and certbot

sudo add-apt-repository universe
sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update
sudo apt-get install nginx software-properties-common certbot python-certbot-nginx

spalladino

#! /usr/bin/env node

const TEMPLATE_FILENAME = 'template.yaml';
const WEBPACK_CONFIG = './api/webpack.config.js';
const WEBPACK_CONTEXT = './api';
const STACKNAME = process.env.STACKNAME;

const { Lambda, CloudFormation } = require('aws-sdk');
const { yamlParse } = require('yaml-cfn');
const { readFileSync } = require('fs');

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AWS_ACCOUNT_ID= # aws account
AWS_USER_PROFILE= # profile in aws/credentials to your access key
AWS_REGION= # default region
AWS_IAM_NAME= # your iam name in the aws account
ARN_OF_ROLE= # the role you want to assume

ARN_OF_MFA=arn:aws:iam::$AWS_ACCOUNT_ID:mfa/$AWS_IAM_NAME
MFA_TOKEN_CODE=$1

read AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY AWS_SESSION_TOKEN <<< \

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[
  {
    "constant": false,
    "inputs": [
      {
        "name": "newImplementation",
        "type": "address"
      }
    ],
    "name": "upgradeTo",

spalladino

from http.client import HTTPSConnection
from base64 import b64encode
from json import loads
from sys import exit, argv, stderr
from time import sleep

import urllib3

# Settings
PRINT_REPOS = True

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#!/usr/bin/env python3

import json
import subprocess
import sys
import re

VERSIONS = [f'0.5.{minor}' for minor in range(0,16)]
RUNS = [0, 100, 200, 300]
TARGETS = ['byzantium', 'constantinople', 'petersburg', 'istanbul']

spalladino

from hashlib import sha256
from sys import argv

with open(argv[1], "rb") as f:
    blocks = []
    
    block = f.read(1024)
    while block:
        blocks.append(block)
        block = f.read(1024)