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 0xdbe22b161ebfc8447b9b98fa55a957b1b952120009d91c0788bd6fa8297fcd55. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce0dc06a-9305-4332-8726-ab56bf5937c5.json and https://artists.proofprofile.net/proofs/artist/ce0dc06a-9305-4332-8726-ab56bf5937c5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Bizet: Carmen, WD 31, Act 2: "Les tringles des sistres tintaient" (Carmen, Frasquita, Mercédès)
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 0x3b9e3843d44c2a4ed281ac71bc82a9bb6b613719b6326ac8d1b4d23f148a4e72. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200865 — a six-check JSON result.
Bizet: Carmen, WD 31, Act 2: "Votre toast, je peux vous le rendre" - "Toréador, en garde !" (Escamillo, Carmen, Frasquita, Mercédès, Moralès, Zuniga)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df70ef54f6b914a01b2f517f14ff82cf8f6efb5b2a5ecb83fdebb1aee9c69d1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200867 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9e3843d44c2a4ed281ac71bc82a9bb6b613719b6326ac8d1b4d23f148a4e72. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200865 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9e3843d44c2a4ed281ac71bc82a9bb6b613719b6326ac8d1b4d23f148a4e72. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200865 — a six-check JSON result.
Bizet: Carmen, WD 31, Act 2: "Vivat ! Vivat le torero !" (Amis d'Escamillo, Zuniga, Carmen, Frasquita, Mercédès, Moralès)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fff54106a7169a90260a7f66abb5ae45f5cb32d7276e16cfb596da10a4c2c5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200866 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df70ef54f6b914a01b2f517f14ff82cf8f6efb5b2a5ecb83fdebb1aee9c69d1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200867 — a six-check JSON result.
Bizet: Carmen, WD 31, Act 2: "Nous avons en tête une affaire" (Dancaïre, Frasquita, Mercédès, Remendado, Carmen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc73409c7762458f5dcefe12f18c495ddbed750c35b59090e25c814c4b00761a. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200871 — a six-check JSON result.
Bizet: Carmen, WD 31, Act 2: "Partez sans moi, j'irai vous rejoindre demain" (Carmen, Frasquita, Mércèdes, Remendado, Dancaïre, Don José)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5329b09dc4893545acea722731f949cb9e45c8e62653193eec247d8097227b. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200872 — a six-check JSON result.
Bizet: Carmen, WD 31, Act 2: "Plus tard !" - "La guerre, c'est la guerre !" (Zuniga, Dancaïre, Remendado, Chœur, Carmen, Don José, Frasquita, Mercédès)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176581e621b5cdc8107035180b1e386c1249d117476eecb9a4a58f615d9a4fdf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200882 — a six-check JSON result.
Bizet: Carmen, WD 31, Act 3: "Notre métier est bien" (Carmen, Don José, Frasquita, Mercédès, Dancaïre, Remendado, Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05be987593583f44300b740bcd04e07892870b1151cf5e1291895c5bc5f1a75. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200886 — a six-check JSON result.
Bizet: Carmen, WD 31, Act 3: "Mêlons ! Coupons !" (Frasquita, Mercédès)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef945203fdf236e16cab17d26d97c214fc9e41dd402b93462e5eba1e06e82c2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200888 — a six-check JSON result.
Bizet: Carmen, WD 31, Act 3: "La mort" - "Parlez encore, parlez mes belles" (Carmen, Frasquita, Mercédès)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d98002a853c779f2d7a33ab39a640480854455dcaecbc4b7f7dbc401b5ea70. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200891 — a six-check JSON result.
Bizet: Carmen, WD 31, Act 3: "Quant au douanier" (Carmen, Frasquita, Mercédès, Dancaïre, Remendado, Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c81b4866a8056434b7c7c7decad39466b13bd7b5dd9e699d8374cac4ca9ee5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1200893 — a six-check JSON result.