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 0xed9100a934f9371e3253e378cceca80b10d0a59d4de62aa3a2030eca7198269f. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ed7cd72e-c9e1-4dc7-b9eb-68bff7f6dedd.json and https://artists.proofprofile.net/proofs/artist/ed7cd72e-c9e1-4dc7-b9eb-68bff7f6dedd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
"L'ho perduta... me meschina!" (Figaro / Act 4) - Live
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xce6299944e25515dc018432afa966ede2fe397510ba8eeec4e2efc3a1021e52b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUM70704357.
"Gente, gente, all'armi" (Figaro / Act 4) - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a928ce078b10c22967b075a1c8975480c51bfebad0d4356c529e1874dc4cb1c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUM70704355.
Le nozze di Figaro, K. 492, Act III: Recit. Eccovi, o caro amico - Live
Mozart: Le Nozze di Figaro, K. 492 (Live at House Of Mozart, Salzburg Festival, 2006)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412b54dcc61f4897feef43c667645a29bb8c82ed52ebf09a0b6be212c4e1852d. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960631244.
Le nozze di Figaro, K. 492, Act IV: No. 29, Finale: e. Gente, gente, all'armi - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5324d3b93694ecc385da7b9bedd1297344821ddd651a0bcccc64a1aa7a68febb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960631262.