Trees (data structures) | Hashing | Error detection and correction | Cryptographic hash functions

Hash calendar

A hash calendar is a data structure that is used to measure the passage of time by adding hash values to an append-only database with one hash value per elapsed second. It can be thought of special kind of Merkle or hash tree, with the property that at any given moment, the tree contains a leaf node for each second since 1970‑01‑01 00:00:00 UTC. The leaves are numbered left to right starting from zero and new leaves are always added to the right. By periodically publishing the root of the hash-tree is it possible to use a hash calendar as the basis of a hash-linking based digital timestamping scheme. (Wikipedia).

Hash calendar
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Related pages

RSA Security | Hash list | Cryptographic hash function | Hash chain | Merkle tree | Hash table