Free · Public priority registry
Stake your work.
Get a receipt the world can verify.
You upload a file. The registry runs the timestamp ceremony — SHA-256 hash, multiple Time Stamp Authority signatures under RFC 3161 — and hands you back a receipt. The receipt is yours. Anyone can verify it offline against published TSA certificates. TimeCairn doesn't need to exist for the proof to hold.
No DOIs. No paywall. No institutional affiliation required.
Hash, witness, archive
You drop a file in. SHA-256 over the bytes, then multiple Time Stamp Authorities sign the hash. Your proofs sit here while you need them and verify offline against TSA-published certificates whether they sit here or not.
Built to outlive us
Keep the original file, timestamp tokens, and the certificate material needed to check them. Verification uses standard openssl ts -verify with the appropriate trust certificates, without depending on a live TimeCairn page. A timestamp is evidence about time, not a grant of ownership.
For the people the system overlooks
For solo inventors, indie builders, citizen scientists, veterans, and pro-se filers — anyone whose priority claim doesn't get the institutional protection it deserves. A verifiable, free, defensible receipt, without asking who you are or where you went to school.