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 0x2353028de8601ea5c620358bff77297dc72b3ff4f617bb30f0a226f1f594a9a8. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e990d672-20d2-4ab0-8296-ba37ff889084.json and https://artists.proofprofile.net/proofs/artist/e990d672-20d2-4ab0-8296-ba37ff889084.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 0x2203fcba3b60dc8e55e9dc965637f05b5358835e3d595485bdf263f1b7d45c1d. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZK6Q2375471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b17b9d7ea8c4a55763da8afde1787079be88fdaf6f923c2cec0c2688e10e95. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:47:22Z), 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/QZRP52263477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd909683a806bed22a8d6226862d325fafdb444a15980ab17f87ed63e34494467. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZTB52242509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8448acba9ef54c7dc301b4927d1eee4af0cc8e534d32a7402656177b0d618a2a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:43:46Z), 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/QZK6M2407443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273a797fc71cf29178145e50d0671f04e5599735207f0447bab93ef2cf5fdb9b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMER2501015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df1bb0d5ac538ad6d1097387f4fc402f0a2530ff6d1d1d8e0de27d6ae6f065f. 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/QZMER2501016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd474354f7fb3cc4e2ffd32409906598d7a515bb412695b4a4e877599aa892845. 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/QZMER2501017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46948815e304255d1399ca2910c73ea879ef5e86f80fef9324202917ce2d702e. 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/QZMER2501018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3331efb59b68a54941e29d6d63c1818436489dc782e96e9bf805cfa64d3c95. 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/QZMER2501019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4d7d03b98dfbefbf520fc7c3e4192202bded859e58d1e34e1b5c2c3dacf730. 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/QZMER2501020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe827e0461c4aadaf1eba62a5cb24893055c1047aa838a1dd4810677d0f7feca9. 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/QZMER2501021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a152d2cacdf8920a3b1aee3451ab007b15e0ea2a93a7353924df24eb74ebcc. 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/QZMER2501022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898bb3e7311777066caff2adc1a9384cc4cd8a0856162c68bca6f810c372a4c7. 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/HUACH2300109.