William Frederick Cody (February 26, 1846January 10, 1917), better known as Buffalo Bill, was an American soldier, bison hunter, and showman. One of the most famous figures of the American Old West, C
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 0x9e245415641d0335024c9f01a6574e20acb017407c815c4676e90260f52cda5b. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e89805ec-6cb5-49c9-b30d-66d860373384.json and https://artists.proofprofile.net/proofs/artist/e89805ec-6cb5-49c9-b30d-66d860373384.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).