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 0x4b0d909e383a1225cd4300eef66a77552c20b44295f6a126b890c4c5f0725a99. Chain 2 (Bitcoin): anchored in block 953600 (2026-06-14T06:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d6b54e1-590d-444a-bf51-e5135deeb9a7.json and https://artists.proofprofile.net/proofs/artist/0d6b54e1-590d-444a-bf51-e5135deeb9a7.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 0x78b085f703daf55905d3271ef7d44219c91729bcba1c10784dee9e8eeb1074b7. 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/ITZA81400147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e24b736582689d055b3e17cd3b09fa05739cbf7f095795e4e517d4990a84de. 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/ITZA81400148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd3bd966a831a47af352069cd054b92a0b385c768017617d110bfc9422fefca. 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/ITZA81400149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b36a8aa03119ca957bd08782109098f36fdf75c1fb76399a1587c9321c2398. 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/ITZA81400150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa3102745ffcda743248fd880b485d75e5c9aed2e4e9f6487a01396f2150c93. 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/ITZA81400151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c9912678df634a0de0e5a93a0781fb94d4ae06f5d4d87219091eed2cf5f903. 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/ITZA81400152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102b4c747faa91a260e43dea85f5f72480bccc334604a1e76bdd46599e2953b4. 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/ITZA81400153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3929947f73d2554fc21387c73dc35c54416917c07bc0e26e842a723c3b554cbd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ITZA81400154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8bb234250ed54008d2141a79dd2641b236e1da344ee4d2fefd7a2e518d36785. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZA81400155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd920c2d4004e69fac727ad972e67ae7560dff0b4a1af230a2fbecb3d58906633. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZA81400156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4079e1d6b4c50002ffa96c0d77fdcfd8a0ad9d2c9ef6b734c0a5ae82de2e8a. 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/ITZA81400157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde97dab3c4647c2ba540cf17c2de4fd288e46292d3bee7cb84dd7b93a74190c4. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ITZA81400158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ec28fe8f0b5ebd3e549c4b3416a6b149c8b28bb3c08d84d49b21e7e6b8f567. 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/ITZA81400159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa196f185c510dc93fdbd7d4f85209ca30a16e6a128c62f847aecb7770df75c7e. 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/ITZA81400160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7992910c12d5077ed9fbc807aedbc1294afc4901205f4b354fb3be4a5d0fd0c7. 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/ITZA81400161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f9490c8129ebf97c67f8e6398ff7a39ce730d5d01e42bbebb89ecc52d6b034. 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/ITZA81400162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b1a2ca2548928f3f0f5c2020f2a677df2e52d929adbe51abec780f11453547. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ITZA81400163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2924e09b63b23bba9deecfe1198831ca41097431cf0dfe3392a43c195fee09. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ITZA81400164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c9b8855d25f0e59c7a3a3ff2f1b71a19e501806de643cc28befb7bdecd5688. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZA81400165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x315ded0800456611b6662f48213d094cfd07acedb7e259abf9fb276eeca46d98. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZA81400166.