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 0xdf7f082ba3f203b7def25c3c3fd886045df74df027c1b25fe0a6b590d2d44ed9. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/491322a7-fe10-440e-8715-570a34f237e9.json and https://artists.proofprofile.net/proofs/artist/491322a7-fe10-440e-8715-570a34f237e9.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 0x608e4a4f88bc9a4e1e3169b129b527144e58999b3d67ae6af272b4bd0bf6f821. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR50X0852301 — a six-check JSON result.
Paris - Istanbul - Shangai: II. La femme de l'eau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb8758a91f73ad206d98b8e4a65fdc361a07dc91ac54a82518b40a6e5dccca6. 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/FR50X0852302 — a six-check JSON result.
Paris - Istanbul - Shangai: III. Au cornet d'amour
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b20968c02c8c8898de42186d5f1da12fb49f2a3db1d76537e8ab6883b25bf4. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FR50X0852303 — a six-check JSON result.
Paris - Istanbul - Shangai: IV. La rêveuse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b76724a9e8b967cfbe37d67e59b7bba4bf80444e685c3fa7d0a96c53481bb8. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/FR50X0852304 — a six-check JSON result.
Paris - Istanbul - Shangai: V. La course de chevaux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1482869e9162627d0ce9d934d93e0c632cb29698171a44451a91dc4beb608f0a. Chain 2 (Bitcoin): anchored in block 960306 (2026-07-30T20:23:53Z), 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/FR50X0852305 — a six-check JSON result.
Paris - Istanbul - Shangai: VI. Kapsberger Forever
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eff4b815e4087b816366f87dd216ac21e5425d2bf11ff470bccb513bebc410b. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/FR50X0852306 — a six-check JSON result.
La route des métaux: I. La cloche et le papillon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ade26f020ddc84750bbd55efdcc2438c7c84dd69567be04c454999c0ca48ae. 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/FR50X0852307 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6fb8c019d84060dab9391ae16c94c2646f888b3a07d503ae7e2d2422ae3259. 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/FR50X0852309 — a six-check JSON result.
La route des métaux: VI. Le boulet rieur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5c4b878427a5e4e5826abce55637dcced9507b6409d7099c9c00bd9a21a32e. 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/FR50X0852312 — a six-check JSON result.
La route des métaux: VIII. Hor che tempo di dormire
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ab48b0374d9e09c64a6edeb2d1929236e78adcf4e10277e8a9c60fbc38edba. 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/FR50X0852314 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fcb06d2c4f9ba0de6f9e17c03caa3d04697e9a31c87354f810be6fe8dcf3f2. 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/DEN961201410 — a six-check JSON result.
Codex Martínez Compañon: Cachua a voz y bajo Al Nacimento de Christo Nuestro Señor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc98bc2c8573acd62bc947ad31bb0953145ec2189b57c3ffad22c682795bc8a. 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/DEN961201420 — a six-check JSON result.
Vendado es amor, no es ciego (Zarzuela): En amor, pastorcillos, no hay quien distinga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6367eaf1a718ba4c9e403b389c07a8c295bc4f4b2aa54b47488b47faf045bd7d. 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/DEN961201430 — a six-check JSON result.
Cantata spagnola HWV 140: No se emendará jamás
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63eb08114de6e6e0ed9f5c12118f1ffc85598c70ab770543bdd262f891812f45. 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/DEN961201460 — a six-check JSON result.
Codex Martínez Compañon: Tonada la Lata a voz y bajo para bailar cantando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3090422a24aef3f270b9e874c3b77d12958a8d0292b2e166c75f65f0088972e. 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/DEN961201470 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728567d774b42c65bccf2ad3d99f18b5c6f8781dba9c9081716ef1fb04862af7. 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/DEN961201480 — a six-check JSON result.
Codex Martínez Compañon: Tonada la Lata el Congo a voz y bajo para baylar cantando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfacf629e43a960e9aa4ec2601592d50a1ae1ed891c01d7516023750357510423. 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/DEN961201490 — a six-check JSON result.
Chaconne for Soprano and Continuo: Sans frayer dans ce bois
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20cdeebfb64b9ecacbc471f30944bcda50af746a95ad1bedacb2fdbcd38d0ec5. 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/DEN961201500 — a six-check JSON result.
Greensleeves To A Ground - Arranged By La Cetra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c79dba7b12dc9a6a3373dcb8e039a6ae9ad4facab387ca06b28b7bf920518c. 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/DEN961201540 — a six-check JSON result.
Veinte cantos populares españolas / II: 8. El vito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefad30c52289a273f4ae245e7b049f58b3ba3d449fae78aca5a250a5391feff7. 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/DEN961003500 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed1f003de7eddf729c26a20609ffbef851946b9f80a5bbc3c37fc4965673cf9. 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/DEN961003530 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3167c4139e84c1d666d9fad91ed8db33fd819c9dd760d00ed46902d4467c5c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEN961003590 — a six-check JSON result.