Aqua Protocol · Version 4
Aqua is an open protocol for data accountability: portable records of provenance, signatures, and time, secured by cryptographic proof instead of platform trust. Work on version 4 is underway; the version 3 documentation is the complete, current reference.
In development
Records are secured by hash chains and cryptographic signatures. Verification requires no blockchain and no central authority: anyone holding the data can check it independently.
Every revision links to the one before it, forming a portable, gapless history of origin and change. Integrity stays checkable wherever the data goes.
An open standard with open-source implementations. Only hashes ever need to leave your hands, so the data itself stays private and under your control.