Bar Kokhba Sextet brings together six core members of Masada under the leadership of John Zorn. An improvisational group of New York's downtown artists, the sextet includes Cyro Baptista on percussion
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 0xa2326f63dd2cde55215dcf4184d3d2e53a793c25a087cffcc299dca51d647417. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f6bfe03-6126-4451-8b79-aeba486f62f4.json and https://artists.proofprofile.net/proofs/artist/9f6bfe03-6126-4451-8b79-aeba486f62f4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).