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 0x539f6f758c48c6aff73ef78cb7a08181ee39436c2081fb1f5f0ca3c98e964c95. 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/5b4b3be5-c572-4746-bd60-f3360f2ee3a6.json and https://artists.proofprofile.net/proofs/artist/5b4b3be5-c572-4746-bd60-f3360f2ee3a6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x7b4d7aeb4f269a64561c303b3410ea85e1b3c6d9c71bd878aac7a54d46581a0e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QME032113781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bac5e4d3d4d955a3d6624b5dce564ece265914aa8e103b2141d2d7f66851390. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMEU31906524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad4ed4fe921200cc4204f9ed4d7f13603e1240bfe1d737e7b8d449047bda185. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMEU32113784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7344347be83f52c7657a6d9c74959d8f1c31eb081a245bcdb13def5b63527f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2338972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d987b95796b0d07afcdfc97adc177924e3e048eabf04f3d0e09d7eb9816bda8. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2338973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a43d839e23ba0424a2dcd77209ed39ffb6285a6228e1d47ab98613a96ad385. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2338974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d7c26ce9cda13d18c503298f1df4a339217497ea355966b3f236c6b9bfcb03. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2338975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe346b3509acd956f40b227b1ed2f1f40672809365ec57459fc65fb2deb7be8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2338976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845b583a5dc611a2304a934abc5889f2b9f315f871ca1fbbe3a35f3ee42ea90a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2338977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c1791cb49fb6a0e23800854f6d4d01eac01a92442a0316243529595eb94f78. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2338978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4bdbe3e9e94845103553435191ce230dc3da9d0803f2efd3d4d791fc8de2e0. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEM2214337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cca0a7857392f159eb5b2824dd28c35e8fc5b89e2098a46c65942fc79bd3a33. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTLA2490346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0741f7900c5a5339aca4a090ae14166230b79c93e3c90537a5f1311724557b9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTLA2407772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc26e3161cf0e8972e18fcf9e9a9171c895f9ad7ca8381bfe35eeaad63a97cbf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTLA2404598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e82d40da09623691d62bd7402f6840867ecd1375153e115218104000cf1abe. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS7J2413994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023f845ad2e56e0b3e3a2df52226ed2e2e9d05acbdc33e7b7cb2d1b2f8c761bd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS7J2441082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7517734b60aca47ff4e17530fcfd49e8e2b80d2ec426f9787180a0c2151a877. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS7J2322599.