def METHOD_NAME(ursulas, test_registry):
    """
    Once launched, all Ursulas know about - and can help locate - all other Ursulas in the network.
    """
    onchain_records = [
        (u.staking_provider_address, )
        for u in ursulas
    ]
    for record in onchain_records:
        address = to_checksum_address(record[0])   #TODO: something better
        for propagating_ursula in ursulas[:1]:  # Last Ursula is not staking
            if address == propagating_ursula.checksum_address:
                continue
            else:
                assert address in propagating_ursula.known_nodes.addresses(), "{} did not know about {}". \
                    format(propagating_ursula, Nickname.from_seed(address))