An open standard — CIP-309
Proof of Existence is now defined by a public, vendor-neutral specification. Any wallet can publish a proof; no one owns the format.
Launching soon — in the coming weeks
CardanoWall is being reborn
A new way to prove your content existed — open, verifiable by anyone, and built to outlast quantum computers. The same blockchain anchor you have trusted since 2021, rebuilt on an open standard.
Since 2021
The proof you have always trusted, rebuilt
For years, CardanoWall has anchored proofs of existence directly on the Cardano blockchain. We have rebuilt it from the ground up — not as another product, but as an open standard anyone can implement, verify, and build on.
What's new
Everything that mattered, made open
Post-quantum sealed messages
Send encrypted records to specific recipients, locked with a hybrid scheme that pairs today's proven encryption with a quantum-resistant one. An attacker has to break both.
Verify without trusting a server
Anyone can confirm a record straight from the public chain — no account, no gateway, and no dependence on whoever published it, or on us.
Open-source CLI and SDKs
A command-line tool and reference SDKs for TypeScript, Python, and Rust let you publish, verify, and script proofs from anywhere.
The standard
Open from top to bottom
The specification, the SDKs, and the command-line tool are all open source — Apache-2.0 for code, CC-BY-4.0 for the standard. Read it, verify records yourself, or build your own tooling on top.