The entry module is a fundamental building block of Proof of History. It contains a
unique ID that is the hash of the Entry before it, plus the hash of the
transactions within it. Entries cannot be reordered, and its field num_hashes
represents an approximate amount of time since the last Entry was created.
| Entry | Each Entry contains three pieces of data. The num_hashes field is the number
of hashes performed since the previous entry. The hash field is the result
of hashing hash from the previous entry num_hashes times. The transactions
field points to Transactions that took place shortly before hash was generated.
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