thumb|upright=1.2|Time capsule plaque in Ypsilanti, Michigan, with instructions for the capsule to be recovered and opened upon the city's bicentennial, on July 4, 2023 thumb|Typewritten documents rec
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5264c546e554484169fb93aa75b1686db975fc1190a26418b0bd5d227b46084a. Chain 2 (Bitcoin): anchored in block 953963 (2026-06-16T15:12:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2823d62c-0b2b-4800-ab62-9394cfe23fdb.json and https://artists.proofprofile.net/proofs/artist/2823d62c-0b2b-4800-ab62-9394cfe23fdb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).