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 0x6d702d1c83acb31fc4335e8e69dbd01f2d4a41f98f2af4f0a1def5195e9dee0f. 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/e25557b3-cb5f-4fe8-8339-5d7b3243455f.json and https://artists.proofprofile.net/proofs/artist/e25557b3-cb5f-4fe8-8339-5d7b3243455f.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 0x9c3a6aba8f1ee62729066271f28897383e5bf1f555101240e797fd85b7368a7a. 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/QZWFH2350220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe279c47aaaf2be66377b9e5d2ed673e06b1611c402150197f6271e0122c0dc. 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/QZPLR2348174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774870ab8b992cb790eee884f10f4b36a986e6d6602592a9e4ebf971df50a5c9. 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/QZWDW2430893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc245534a8bff45fc1240eec552fc7f39891576b8f8fef09bb1918b0e775b7ad5. 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/QZWDW2430894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c6c565b66d3b666f948e854977883d8bcd5be4625a4aec3aa51171b4b243f4. 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/QZWDW2430895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d414739f223f0c6b6e4fc9ef9f22bb726d3ac5172b4c001d41c5196de86ea6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWDW2430896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8508761eda47e138cd6da56a7d19d74a4f8cf66eaf93affe872f04bf591b8622. 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/QZWDW2430897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee13232f13548ce0f90376e9170e9772d7ad9bb41bb3f368a26e0174ccdc00b. 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/QZWDW2430898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2631918c212a5695dba1f9794005cc958d4e57e1dbacc866d9b840c23524dbb. 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/QZWDW2430899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd521a430cdc0a9399b41085d918a7e093819beb24562e013543bbeea859a2b00. 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/QZWDW2430900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19e5e9ace3a70744646fa6788f137395e30db7ef993790266f49c0479dee2af. 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/QZWDW2430901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2d7a5c2e1981c75d60197f6b3d7e918c234d96907f89214778e4c783cc38f0. 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/QZWDW2430902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5248a6fab42b659dc6b23651fc3979066882a8917e43bc7d78606273a181c902. 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/QZWDW2430903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b1758585fa49d5c76f5c52fd0ad5fda70968c916f9bb94f7fa17f66054c149. 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/QZWDW2430904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc2f69981767fc1f46f799c573c6f78d823871e7f073576775ee225a924b7a5. 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/QZWDW2430905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36bb434a6c1862f08557e92782250953c43b95a28ed5523b0dda3066f534759. 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/QZWDW2430906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68d66bdbb3645a13526dff828721e472f12b7bd625d0199ba6c4f343df7581c. 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/QZWDW2430907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5c47aa8b2bfd4f4e4912d204fb7f0ee59d2925e6c5ad8152c519feeefda9fb. 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/QZWDW2430908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c55bc07836793b09fef79e2903933c396e5cc9eb7bd6debefa80c43dfb1333. 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/QZWDW2430909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9df0513abd0a9b6f52c1c57aaeb4fc35cc79cd2625cef0fe8f488edd40103bf. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZN882524700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488f3bc74a0fd6a78f7f11a5100d493598a032ab54ebe4573d9b820845d48d90. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZN882524707.