code: function(bitcoin) {
      //validate arg
      var bitcoinType = typeof bitcoin;
      if (bitcoinType === 'string') {
        bitcoin = toNumber(bitcoin);
        bitcoinType = 'number';
      }
      if (bitcoinType !== 'number'){
        throw new TypeError('toSatoshi must be called on a number or string, got ' + bitcoinType);
      }
  
      var bigBitcoin = new Big(bitcoin);
      return Number(bigBitcoin.times(conversion));
    }
docs: Convert Bitcoin to Satoshi
  @param {number|string} bitcoin Amount of Bitcoin to convert
  @throws {TypeError} Thrown if input is not a number or string
  @returns {number}