takes an event block and returns a signature for sha3 hashing
    :param event_block:
    :return:

def get_topic_sha3(event_block):
    '''
    takes an event block and returns a signature for sha3 hashing
    :param event_block:
    :return:
    '''

    sig = ""
    sig += event_block["name"]
    if not event_block["inputs"]:
        sig += "()"
        return sig

    sig += "("
    for input in event_block["inputs"]:
        sig += input["type"]
        sig += ","
    sig = sig[:-1]
    sig += ")"

    return sig