Use cases
Historical & research verification
A model's knowledge cutoff is an accidental witness to what was publicly known by a given date. A tamper-evident record of that cutoff makes the witness trustworthy enough to cite.
Provenance & integrity audits
Confirm that a downloaded checkpoint's bytes match what was originally published — rather than a silently modified, backdoored, or swapped file with the same name.
Legal & IP disputes
Establish, with cryptographic evidence rather than a hosting platform's word, that a specific set of weights existed in a specific form by a specific date — relevant to copyright, trade secret, and priority disputes.
Fine-tuning attribution
Verify the exact base checkpoint a derivative or fine-tuned model claims to descend from, instead of relying on an unverifiable README claim.
Compliance recordkeeping
Give organizations subject to emerging AI regulation a verifiable audit trail of exactly which model version was deployed and when.
Journalism & fact-checking
Let reporters independently verify a vendor's claims about when a model was trained or what information it could plausibly have had access to.
What's in it
The registry currently spans hundreds of models — early research checkpoints, widely-used open base models, and current-generation frontier releases — each entry recording its issuer, license, knowledge cutoff, and source. It's organized as a single searchable list in the Explorer, growing as new open-weight models are processed.
Open-source model repositories can be silently edited, re-uploaded, or taken down, which is exactly why each entry here is fingerprinted rather than just linked or described.
How it works
Each model's weights, config, and tokenizer files are hashed with multiple algorithms (SHA-256, SHA3-256, BLAKE3) and combined into a single fingerprint. That fingerprint, together with the model's name, issuer, source, and claimed knowledge cutoff, is timestamped on Ethereum using the Ethereum Attestation Service — a public record anyone can check independently by recomputing the hash from the same public files. (Currently running on Sepolia, Ethereum's public testnet, during this project's build-out.)
Get involved
Browse the full compilation in the Explorer, or get in touch below.