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 0x215f216e5fccda09eb3da72b0ec83b3cbbeaaa48f31cd51e2024f8182aa1b54b. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1754d4b6-7403-42f0-97a2-88d54c5b0096.json and https://artists.proofprofile.net/proofs/artist/1754d4b6-7403-42f0-97a2-88d54c5b0096.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lakmé / Act 1: Quand une femme est si jolie...Leur vertu bizarre manqu
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 0x707638d8ddea04e8cf534b4d336930df92c0ec09a97748ea8c7c71a6a3ab0645. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBF076711141.
Lakmé / Act 2: Allons, avant que midi sonne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380575cf9b4e32308486c91702452c8c1390191435f33c87124f4dc83b0766d7. 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/GBF076740415.
Rigoletto / Act 2: "Povero Rigoletto!...La rà, la rà"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b551ce5d97375416045cad62e600094b3e0a7bb3a0ac42c355b0bb628e3b968. 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/GBF077130119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b551ce5d97375416045cad62e600094b3e0a7bb3a0ac42c355b0bb628e3b968. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF077130119.
Les Huguenots / Act 2: O beau pays de la Touraine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3147c65d2561dfec6f2d2a138042a27ad49cbfb017054161ecd9d9e01585f8ae. 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/GBF076940815.
Lakmé / Act 1: Miss Rose, Miss Ellen, respectez les clôtures
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcadc1105abdf254006ba841653b99b19b5ff77b2de45803d02ee867e80ce369f. 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/GBF076740406.
Lakmé / Act 1: Quand une femme est si jolie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62091d83c282312112f7edc1c7ef751c5b4f81be8b53b17d9906a4153bfaa504. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/GBF076711570.
Lakmé / Act 1: Leur vertu si bizarre manque d'apparat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd213f5068915be26a58a5e78ae2634defc9fc900da5d19f24c3cac612fd21c3f. 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/GBF076740408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233edba7d7751885e33f31762601e73a6d91dca886dc92efe7d70098b9553b3d. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/GBF076740416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78649be70ae6aa39adebee26d91c749e92d860e1d6a1a919574a623918d955a8. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBF076740418.
Lakmé / Act 2: Voyez cette ville en fête
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a1a2b7e1b529f67af7c02b3bd27202b1f3aac2c4f87d66599376bf31da9bbd. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBF076740428.