thumb|A promotional poster for the Sandow Trocadero Vaudevilles (1894), showing dancers, clowns, trapeze artists, costumed dogs, singers and costumed actors Vaudeville (; ) is a theatrical genre of v
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 0xee63983b213c9be9bd0af882385a993dec8139e1d397cb2a753b60be24e25f1f. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9b37eba-c288-4cca-a132-c1a42a3147bd.json and https://artists.proofprofile.net/proofs/artist/a9b37eba-c288-4cca-a132-c1a42a3147bd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).