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 0x9734090e53ac87867ed0222a0bd093e414c4e944266ff20692d29ac8fc328d5a. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f558479c-415f-4745-9cfb-8f53b86c37b5.json and https://artists.proofprofile.net/proofs/artist/f558479c-415f-4745-9cfb-8f53b86c37b5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0xbe2d2db4a81361f81179bbe61ac9a91aca23b62f487f755e602a7671081acaf5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2200318 — a six-check JSON result.
Tosca, SC 69, Act I: Mario! Mario! Mario!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ce5a342f52b66192c0abd715b3bde174379e54ec73acf4f054b9b6e44d107b. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/GBBBC2200319 — a six-check JSON result.
Tosca, SC 69, Act I: Non la sospiri la nostra casetta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29e0c88fd483b2622a2c587a3307ed1267fee49efdf95a5989f413904715cbf. 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/GBBBC2200320 — a six-check JSON result.
Tosca, SC 69, Act I: Or lasciami al lavoro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b99b599b41800ddbffa2ffc4f1ec4137b1ecb754c119dfc30dc436eb64f9a92. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2200321 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0638878ebdc08f0c779d31ee09d89b35c6e5f77e981a8d53130b24c14cf4e763. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBBBC2200322 — a six-check JSON result.
Tosca, SC 69, Act III: E lucevan le stelle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4131d01a6c7618e27c463c467734cff15758df1857bd9ac73866d2cf2f8c71. 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/GBBBC2200323 — a six-check JSON result.
Turandot, SC 91, Act I: Non piangere, Liu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a038d397bd00df67fee50772cc99e99d915b0ad74b60ed4966205a16e56001. 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/GBBBC2200324 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4868ae57a8efacf49fed3a94afcc96728244158a2487ee7710f4df17229797. 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/GBBBC2200325 — a six-check JSON result.
Madama Butterfly, SC 74, Act I: Vogliatemi bene
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c3756df3b39446f481469d045f79f49448db22c7f1e0285dbd52022c45ada0. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBBBC2200326 — a six-check JSON result.
Madama Butterfly, SC 74, Act I: Vieni, vieni!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8bab3406ddb61ae4ce56774a82c6e483fee45557582ae10c28c5ea08862e514. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBBBC2200327 — a six-check JSON result.
Madama Butterfly, SC 74, Act II: Addio fiorito asil
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cc6733e3aea20047c7b476860ad96cd1d8eb0493b6ceb0545934dad8d472cf. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GBBBC2200328 — a six-check JSON result.
Carmen, WD 31, Act II: La fleur que tu m'avais jetée
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9f94572e17dd09f5be9aa64325857cfc7a5ff68ce24af59c1f339da504c656. 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/GBBBC2200329 — a six-check JSON result.
Carmen, WD 31, Act IV: C'est toi, c'est-moi!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f341c732ea24ce44dd9927937f983c346c7b762b5fa5248d4444f068cfb1a2. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GBBBC2200330 — a six-check JSON result.
Carmen, WD 31, Act IV: Viva! Viva! La course est belle!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bc1f4d1e898143dbbb4e1f3230c4a0304d39d165367fd1a81e50ca07c145b0. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBBBC2200331 — a six-check JSON result.
Martinia Franca Festival - 30th Anniversary
Italian Operatic Overtures, Vol. 2: The Early 19th Century
Opera Arias (Soprano): Ciofi, Patrizia - Traetta, T. / Meyerbeer, G. / Rossini, G. / Donizetti, G. / Piccinni, N. / Massenet, J. / Verdi, G.
La fille du regiment: Act II: Il faut partir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0542605e48c538ac16e92d66135c9b81de797e5044e4cf3ff76086fea8115b6. 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/ITN320903015 — a six-check JSON result.