content-addressed storage

Storage where an object's identifier is derived from a hash of its bytes, as in an IPFS CID, so the address itself proves what it delivers: change one byte and the identifier changes. It is a stronger immutability claim than a change receipt, which proves a difference between two dated observations. It says nothing about authorship or time: anyone can store any bytes, and the identifier does not say when. Paired with a timestamp proof it becomes a dated, verifiable copy; alone it is only a verifiable copy.

Terms this definition uses

Object · change receipt

Proof and provenance

Showing a record existed at a date without asking anyone to trust us.

OpenTimestamps · anchoring · Content hash · Manifest tampering · C2PA · CAWG training and data mining assertion

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