create an offline address by coin toss: requires https://github.com/libbitcoin/libbitcoin-explorer

coldaddress.sh

#!/usr/bin/env bash

length=256
bits=()
prvk=""
pubk=""
mnemonic=""

# collect coin flips
function getBits() {
    msg="Start flipping!"
    echo $msg
    msg="Enter 1 for heads, 0 for tails: "
    while [ "${#bits[*]}" -lt "$length" ]; do
        read -p "$msg" bit
        if [[ $bit =~ ^-?[0-1]$ ]]; then
          bits+=($bit)
          msg="${#bits[*]} of $length bits: "
        else
          msg="Enter 1 for heads, 0 for tails: "
        fi
    done
}

# convert to string
function getBitString() {
  local str=$(echo "${bits[@]}")
  echo ${str// /}
}

# convert to hex
function getHexString() {
  local bitstr=$(getBitString)
  echo $(printf '%x\n' "$((2#$bitstr))")
}

function mnemonic() {
  mnemonic=$(bx mnemonic-new --SEED $1)
}

function privateKey() {
  prvk=$(bx hd-new $1)
}

function publicKey() {
  pubk=$(bx hd-public -d $1)
}

function newAddress() {
    local seed=$(getHexString)

    mnemonic $seed
    privateKey $(bx mnemonic-to-seed $mnemonic)
    publicKey $prvk

    echo ""
    echo "You have created a new Bitcoin Address!"
    echo "Public Key: $pubk"
    echo "Private Key: $prvk"
    echo ""
    echo "$mnemonic"
}

function main() {
  getBits
  newAddress
}

main

requires https://github.com/libbitcoin/libbitcoin-explorer