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 0x37d580704a7c5ec43cb5a5ace8153e5e41a34a724b766b73bee1faded900d942. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9316094b-5b89-4323-b13a-052b275941a7.json and https://artists.proofprofile.net/proofs/artist/9316094b-5b89-4323-b13a-052b275941a7.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Bohemios, Act I: Chanson de Cosette (Roberto, Victor, Cosette)
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 0x4e227ad2844f72936733e01b8e29d92a9edd2b348ff378f53be4cdb6d765e00c. 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/FRX201667784 — a six-check JSON result.
Bohemios, Act I: Chœur des bohèmes (Victor, Chœur, Cosette, Bohemio,Juana, Cecilia)
Coro Polifonico De La Universidad De La Laguna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c90bbda4b1393a3d5a409ca62eacc280ffd44b8b749dea5c1baf46e97b153db. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRX201667786 — a six-check JSON result.
Bohemios, Act I: Que Alegre es el cielo (Roberto, Cosette, Juana, Cecilia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591c86f58ada65eba64f9a1ee33dfcf360dd254af88cf813d7d391d08c103c9e. 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/FRX201667787 — a six-check JSON result.
Bohemios, Act I: Linda Cosette (Girard, Chœur, Victor, Roberto, Marcelo, Cosette)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfabf56a31ae825513582ad61714658e6a6a6d22b49f8201a2032ca9c1f1784. 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/FRX201667789 — a six-check JSON result.
Doña Francisquita, Act I: El Lañador (Lañador, Buhonera, Cardona, Fernando, Aurora, Irene, francisquita, Doña francisca, Doña Liberata, Doña Basilisa, Lorenzo, Juan Andrés)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4144a148f9691d61ae101ac5026c27a50b5e69fcdcad4f66798e148d8f83858c. 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/FR10S1732186 — a six-check JSON result.
Doña Francisquita, Act I: Siempre Es el Amor (Francisquita, Fernando, Cardona)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1b786762348a6c8e62fb1693f5c8025b08eba840184517b783a29ede6c9f66. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1732187 — a six-check JSON result.
Doña Francisquita, Act I: Allí la Tienes (Cardona, Fernando, Aurora, Irene)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2f98e3209af1297d3b2d8153117500f533f2a169ac4c8b672a3be99e79a354. 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/FR10S1732188 — a six-check JSON result.
Doña Francisquita, Act I: Cuando un Hombre se Quiere Casar, Pt. 1 (Cardona, Fernando, Coro)
Coro Polifonico de la Universidad de la Laguna Rondalla de Tenerife
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f492d853fcbda15d5bf9ca783ef63f7a3af81785ea778e39ce67cd6f8adf0ef. 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/FR10S1732189 — a six-check JSON result.
Doña Francisquita, Act I: Canción de la Juventud (Cardona, Fernando, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb54d4b15d8e0bc7508b7d22619ea13d07e26130caf94c53f76f76853432f26e. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/FR10S1732190 — a six-check JSON result.
Doña Francisquita, Act I: Canción del Ruiseñor, Pt. 1 (Francisquita, Fernando, Cardona)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cbdea99ab889d5881fcf48d5fd0fb1ccf10d356b1bd0ae0df6a1a6c189b53e. 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/FR10S1732192 — a six-check JSON result.
Doña Francisquita, Act I: Canción del Ruiseñor, Pt. 2 (Doña Francisca, francisquita, Fernando, Cardona, Aurora, Lorenzo, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0817a8e4c342803bcf466569cb2b30c946fb8013bc9f624e152b405f89acdfd. 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/FR10S1732193 — a six-check JSON result.
Doña Francisquita, Act II: Bella Estrella (Francisquita, Doña Francisca, Fernando, Cardona, Don Matías)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0db49cbb295275fb63f5d8c2dad875335cae33dbcd96a481ad12b1e673c615. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FR10S1732198 — a six-check JSON result.
Doña Francisquita, Act II: El Que Mis Bailes Quiera (Lorenzo, Aurora, Francisquita, Fernando, Cardona, Don Matías, Doña Francisca, Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8fe216b48e55d40628019cbdaabcea2ed03ad753be18e912a58cb383a2cf6a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1732199 — a six-check JSON result.
Doña Francisquita, Act III: Aurorilla la Beltrana (Sereno, Coro, Aurora, Fernando, Cardona)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b28c671fe85fb61cb9c932497855a1d007c90cbf28587552b9541e5eed6360. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/FR10S1732201 — a six-check JSON result.
Doña Francisquita, Act III: Canción del Marabú (Aurora, Cardona)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cb0df599a42b3519420ef41466c0058acdc384c6e289a267357abef9798022. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/FR10S1732202 — a six-check JSON result.