JBaczuk

import React, { useEffect, useRef, useState } from "react";

function usePrevious(value: number) {
  const ref = useRef<number | null>(null);
  useEffect(() => {
    ref.current = value;
  });
  return ref.current;
}

JBaczuk

Mongo Authentication

• Start mongod without auth enabled Make sure this is commented or missing from /etc/mongod.conf

#security:
#  authorization: enabled

The service should be running:

JBaczuk

#!/bin/bash

echo
echo "Welcome to the Bitcoin address generator!"
echo "input private key (32 bytes, hex format)"
read priv
echo ""
echo "#####################################"
# priv=0C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D # Testing only

JBaczuk

#!/usr/bin/env python
import sys

# Get command line arguments
##########################
# Note this script will calculate based on an average of 1 day's worth of blocks
if len(sys.argv) < 2:
    print "Usage: $ btc_hashrate <blocks-24h> <current-difficulty>"
    sys.exit()
    

JBaczuk

assert(consensus.hashGenesisBlock == uint256S("0x000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943"));
assert(genesis.hashMerkleRoot == uint256S("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));

JBaczuk

/**
 * Build the genesis block. Note that the output of its generation
 * transaction cannot be spent since it did not originally exist in the
 * database.
 *
 * CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
 *   CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
 *     CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
 *     CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
 *   vMerkleTree: 4a5e1e

JBaczuk

#!/bin/bash

if [[ $# -lt 1 ]]; then
    echo "Usage: $ secp256k1 <private-key-hex>"
    exit 1
fi

priv=$1

## Calculate Public Keys

JBaczuk

#!/bin/bash
## Command Line parsing
#######################

if [[ $# -lt 1 ]]; then
    echo "Usage: $ sha256 <input-hex>"
    exit 1
fi

inputHex=$1

JBaczuk

#!/bin/bash
## Command Line parsing
#######################

if [[ $# -lt 1 ]]; then
    echo "Usage: $ hash160 <input-hex>"
    exit 1
fi

inputHex=$1

JBaczuk

#!/usr/bin/env python
import sys

if len(sys.argv) < 1:
    print "Usage: $ reverse_endian <input-hex>"

line = sys.argv[1]

n = 2
orig_list = [line[i:i+n] for i in range(0, len(line), n)]