Even with collaboration between A, and B changing the hash values plus dates and times recorded at A and B is prevented. By linking A 's timestamp at a particular time with timestamps previously generated by B. Owing to the fact that there are. Many users in the network those timestamps, will most probably be generated for other equipment. All hash values are linked. In order therefore B, is not able to forward date a hash value for A since that would require knowing in advance what hash. Value request came before it. It would also be possible to check and contact the source of the previous data ie. In I,,, In order to prove that A 's hash value is timestamped in the correct sequence.
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