Generating BitStamp Signature in PHP

October 31, 2015

This post will describe how to create the signature required by the BitStamp API for private calls to the API.

In the BitStamp docs, they’ve shown how to do this in Python:

import hmac, hashlib
message = nonce + customer_id + api_key
signature =, msg=message, digestmod=hashlib.sha256).hexdigest().upper()

In PHP, this is made possible by the hash_hmac function.

This is the function I’m using to do this in PHP


 * Generates the signature required by Bitstamp API
function generateBitstampSignature($nonce)
    $customerID = '123456';
    $bitstampApiKey = 'apikey';
    $bitstampApiSecret = 'apisecret';
    $message = $nonce . $customerID . $bitstampApiKey;

    return strtoupper(hash_hmac('sha256', $message, $bitstampApiSecret));

I hope this saves someone a few seconds somewhere ;)