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 0xc1f782ce6dfb91659ccfe2de0f84563de0c8c2ace9ced63e46f50028a04b6978. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e92a8b85-395b-4771-a207-e7bc55db3a74.json and https://artists.proofprofile.net/proofs/artist/e92a8b85-395b-4771-a207-e7bc55db3a74.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 0x69173b687746caf919a28d22de7d2b1af0fb9027c13304b8dfb6626bb9475f0c. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZWFK2474411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86f3e1dcabb918863df8832ab7817da6f2fd31c651e8a776814870f673d58ee. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFK2474412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd68f9b1db669c6670f335ed05c9dd8180d1d8f3d3550256771632412883f9e. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QZWFK2474413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3607bfec4cc7882e514a465766e3176210ddfa1af9fc0cdd1bd1d9ce318baff. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFK2474414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2a0dbc6471e915398f82d8524046458ef1fdc41a28b0be2e103a83a0c1aeaf. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFK2474415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb641127a59a43c9975329be52e97720d7ffdc302984ad9514eb93adc8d6db607. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZWFK2474416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d86a2486c2be9aaab62d511b4e13ebf2e4d759c7eab55b1a2052acf1d79c8d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFK2474417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91569781c5ac1ad74c7868f182919b5d8d54ac4cc69100a1794a49a3f295836. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZWFK2474418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e239221104577fcb3bfcb50c1247a87cdd048410c3bef7de6cae003a6ceb25. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZWFK2474420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f57b681d41bbe99d94a93f8aed81a79a88f8f6f8c4cb28b8022221e6d4b48a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFK2474421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339f69b35b0588c284a59ec3f907a24eadce5ff3dfb9267290e681cdcdec43ee. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZWFK2474422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cdfa9d5bbf3dd79174c67d840d202c9c552a436c0a7e42412dc1f47b288d3d7. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZWFK2474423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9802a7d6dcfbdfbf5410cb87533b47b5cc9ebdd912b81074fb85fd0edfbb15. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZWFK2474424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e421f2fbb50ff4a0c4e511e2181193d9103569a5ee5e038dd8dbdb0eb4ff05. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFK2474425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0de4e735a4c38befe32a52885d91a9f95b26180672d12543d4c1e3d2ee14a27. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZWFK2474426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a86df57275cb9279354b18d7161182c3278ba32d9845d4a292f773ff880850. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFK2474427.