code: function getAddress (publicKey) {
  	var publicKeyHash = crypto.createHash('sha256').update(publicKey.toString('hex'), 'hex').digest();
  	var temp = Buffer.alloc(8);
  
  	for (var i = 0; i < 8; i++) {
  		temp[i] = publicKeyHash[7 - i];
  	}
  
  	var address = bignum.fromBuffer(temp).toString() + 'R';
  	return address;
  }
docs: @method getAddress
  @param publicKey string
  
  @return {hex publicKey}