Each satellite uses its clock to timestamp the signal it sends back to Earth.
Instead, Haber and Stornetta envisioned the technology as a way to timestamp digital documents to verify their authenticity.
In meatspace, there a variety of mundane ways to timestamp a document, such as sending yourself the document in a sealed envelope or making chronological line entries in a notebook.
Blockchain provides external security, timestamps, authentication of the document's creator (or at least, authentication of whoever checks the document into the blockchain), non-repudiation, as well as verification that the document has not been tampered with.
If the timestamps on documents provided to VICE News are correct (something that the NSA has admitted is a problem with this FOIA response), she actually provided her side of at least the OGC contact even before the Agency All email.
The bank would then send the summary of transactions to clients including the date of each transaction and the rate assigned by the bank, while leaving out the transaction timestamp and the how the specific rate was assigned, the documents say.
As Haber and Stornetta realized, timestamping a digital document would require solving two problems.
The authors proposed an early adoption based information flow (EABIF) network by comparing the timestamps when users access documents, and a topic-sensitive early adoption based information propagation (TEABIF) network according to the topics of the documents users accessed [27].
An obvious solution to this problem is to send the digital document to a timestamping service that would retain the document in a "digital safety deposit box," which meets both of the criteria mentioned above.
For example, Fig. 2 illustrates the list of selected key terms with weight from the document subset with timestamp June-July 2010. June-July 2010
That transaction cannot be changed, so when that hash string is searched for again, you can have complete confidence that the document has remained unchanged and the timestamp is accurate.
