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 0xba9eb265664d9017c12508da08ae3e0dc6d094a50bd71394423774efa843e2fd. Chain 2 (Bitcoin): anchored in block 953888 (2026-06-16T04:55:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d66b63d-9588-4198-b1ac-8ca99636557b.json and https://artists.proofprofile.net/proofs/artist/0d66b63d-9588-4198-b1ac-8ca99636557b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Estancia, Op. 8: Scene 1, El Amanecer - Introducción y escena
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 0x1b3dbf95da81e11953e80056ad0327fb232c23854bc3c6821e923736e7f09d76. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/US23A9468880 — a six-check JSON result.
Estancia, Op. 8: Scene 1, El Amanecer - Pequeña danza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a5c99b05449554ad6dc648632db4efd563974d123bca7c89f2efec5258b518. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/US23A9914930 — a six-check JSON result.
Estancia, Op. 8: Scene 2, La Mañana - Danza del trigo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e01008d68b091a1ac54cbe48e3575619c66bc3e55921fe1871e236afaf64102. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/US23A9468885 — a six-check JSON result.
Estancia, Op. 8: Scene 2, La Mañana - Los trabajadores agrícolas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a8084c6988c0e26308d78c27f080791043f2b9effb64f6421aac42fbccec7a. 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/US23A9914935 — a six-check JSON result.
Estancia, Op. 8: Scene 2, La Mañana - Los peones de hacienda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcb91c5b35faa82716debb7a3feee41350e730d938c676739fdde3216dcaa11. 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/US23A9468886 — a six-check JSON result.
Estancia, Op. 8: Scene 2, La Mañana - Los puebleros
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ec5318557e93a9ca77fec0848a26fce0aa4c024b0a314cf2a18ab32415b581. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/US23A9914936 — a six-check JSON result.
Estancia, Op. 8: Scene 3, La Tarde - La doma
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24be08a8c4fa790a356588b667e9dab95299080343146a9f4e51449f4eb7e0a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/US23A9914933 — a six-check JSON result.
Estancia, Op. 8: Scene 3, La Tarde - Idilio crepuscular
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbddd3ae285d88315a805fc7d2cc05e3305c90faa3a4c630b2117ddcc2deaf28f. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/US23A9638138 — a six-check JSON result.
Estancia, Op. 8: Scene 4, La Noche - Nocturno
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa345cb9f267cc873ad068b9c6367dc740adefabb5613ac19b2ab848ef4208035. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/US23A9638139 — a six-check JSON result.
Estancia, Op. 8: Scene 5, El Amanecer - Escena
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45fb131020cf48a41c8ef28f007c838c705ab4e434701e8e0b40cb986f88165e. 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/US23A9638137 — a six-check JSON result.
Estancia, Op. 8: Scene 5, El Amanecer - Danza final (Malambo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eeb55cbe956c6b2fca12f4c1b5c8400d5d3cd49576a9d902fd586f421814b30. 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/US23A8728287 — a six-check JSON result.
La Fanciulla del West, SC 78, Act I: Che faranno i vecchi miei
Transylvania State Philharmonic Orchestra of Cluj-Napoca
Transylvania State Philharmonic Choir of Cluj-Napoca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3f11e52a49d2b3e02f476ad1824161b717f314bc8a1ef7bcc69939c5e08b45. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLE421805303 — a six-check JSON result.