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 0x6cdb18da0be37c25162ed0261a6d96be23d59fbbc74089748404123877f3b429. Chain 2 (Bitcoin): anchored in block 953710 (2026-06-14T23:32:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f24e64c-206c-45f9-88ff-aa5f0c94a920.json and https://artists.proofprofile.net/proofs/artist/7f24e64c-206c-45f9-88ff-aa5f0c94a920.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 0xb6581168bc77cb1a6d3d1af621bd06d3e8c0b273e09331b0679f716fbe1f2a87. 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/NLE421404901 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3cd7535bce509d9758de70517472af93a77fd7d38c02b3442c55dd07cff8b7. 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/NLE421404902 — a six-check JSON result.
Sieben Magnificat Antiphonen: I. O Weisheit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf34bbe064844de117ed276470f7d7a03015f640d84e6449a4fb3d699c93146. 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/NLE421404903 — a six-check JSON result.
Sieben Magnificat Antiphonen: II. O Adonai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4df6e0401aab2f81173ad40052821e23fff871b194528c7e604dc963bf31cc. 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/NLE421404904 — a six-check JSON result.
Sieben Magnificat Antiphonen: III. O Spross Aus Isais Wurzel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb80cb6b159a86ab21a2a38f357515db8fce74fdd9a1dee25845233ac0db4941. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/NLE421404905 — a six-check JSON result.
Sieben Magnificat Antiphonen: IV. O Schlüssel Davids
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d5993f0a8ef8194e34f8b50d62e2fd2f61ba87b4fed7ff7c55e19ec813942f. 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/NLE421404906 — a six-check JSON result.
Sieben Magnificat Antiphonen: V. O Morgenstern
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8a19d27ce586f0ba2ab2a559e3577f25580a72e5264956f9ac2ac347451296. 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/NLE421404907 — a six-check JSON result.
Sieben Magnificat Antiphonen: VI. O König aller Völker
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8191eda29a1b4aaa11a60466f11647b1750d93777730fb25cf6621575e4c088. 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/NLE421404908 — a six-check JSON result.
Sieben Magnificat Antiphonen: VII. O Immanuel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e2dabaee88cfe0ad3e1a23f611cbfb2fcffac08a90976a630c88b247d3b72a. 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/NLE421404909 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a2c3001a5de37d369e4f0af094a8c6a559f69d2a17088230f15d9facc750d10. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NLE421404910 — a six-check JSON result.
Prayers of Kierkegaard: I. Great are You, O God
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8386a206f4463db7cb7923d055010aba0ab131dcfbf9eacaaa4244cf395062. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLE421404911 — a six-check JSON result.
Prayers of Kierkegaard: II. Father in Heaven! You loved us first!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab489b92324426368e42470d4015dd5e89e99453040bc9e2b54f3f462c0c34fe. 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/NLE421404912 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e21fe319fe312e2bc14a4b05c2873dae536a0ef4912b2e74df7cc6ac5465ee. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/NLE421404913 — a six-check JSON result.
Four Songs of Love: II. Until the Daybreak
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2474d7d9db505e57305b0f4f0f17778655ca8a65dce5f3f35e070005f9293b1. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/NLE421404914 — a six-check JSON result.
Four Songs of Love: III. Awake, O North Wind
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b4eb9bf6bef188e2c6c4f354381ee356822f038b05af10c11165d29690697a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLE421404915 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d35ca48f5100b6442fa7cf7888d3649db9cacb81b7af1c6f27812e733f5a13. 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/NLE421404916 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a8b6794ce144968f9a61d2b669f515bad56a18995c24849d878038fc83fc6c. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/NLE421404917 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7fa1ddcd46b84c0fcb7582aa145d7b347476c34325ec228ad599c7aaa87b27. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLE421404918 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8924e4338d4cb6fa3e42b7249ea8352456112d6feded28311aef9b8a5ed684c4. 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/NLE421404919 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7fa1ddcd46b84c0fcb7582aa145d7b347476c34325ec228ad599c7aaa87b27. 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/NLE421404918 — a six-check JSON result.