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==Verification==
During an interval, the transient private key is used to sign data concatenated with trusted timestamps and authenticity certificates. To [[File verification|verify]] the data at a later time, a receiver accesses the [[Persistence (computer science)|persistent]] public key for the appropriate time interval. The public key applied to the digital signature can be passed through published cryptographic routines to unpack the [[Cryptographic hash function|hash]] of the original data, which is then compared against a fresh hash of the stored data to verify data integrity. If the signature successfully decrypts using a particular interval’s published public key, the receiver can be assured that the signature originated during that time period. If the decrypted and fresh hashes match, the receiver can be assured that the data has not been tampered with since the transient private key created the timestamp and signed the data.
Transient-key cryptography was invented by Dr. Michael D. Doyle of [http://www.eolas.com Eolas Technologies Inc.] and later acquired by and productized by [http://www.proofspace.com ProofSpace, Inc]. It is protected under [http://www.freepatentsonline.com/6381696.html US Patent #6,381,696] and has been included in the [[ANSI ASC X9.95 Standard|ANSI ASC X9.95 standard for Trusted Timestamping]]. Despite the appearance that the [[Bitcoin]] [[block chain (database)|block chain]] technology was derived from Transient-key cryptography, Dr. Doyle has publicly denied he is [[Satoshi Nakamoto]].
* [http://www.proofspace.com ProofSpace, Inc] has published a more detailed [http://www.proofspace.com/protected_form.php?file=proofmarksystemtech.pdf technical overview document] of transient key cryptography.
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