The format looks as follows:
32bit p2p version - 32bit id - 4bit message type - 4bit message name -
160bit sender id - 16bit tcp port - 16bit udp port - 160bit recipient id
- 16bit (4x4)content type - 8bit network address
information.
Calculates the approximate probability of the contains() method returning
true for an object that had not previously been inserted into the bloom
filter.