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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 0x6819c0b0e2499091770b26758b3d3ba51d99b6f42528f2781a1762cba2eccbc7. 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/32b536c7-d7b3-4e6b-b345-815e0a9659a9.json and https://artists.proofprofile.net/proofs/artist/32b536c7-d7b3-4e6b-b345-815e0a9659a9.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 0xd544ea097ead4a6eaad346ce6dc19af3ff698698d146768dcdefdc1fa8c0500c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLC8K1400120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c706795e78c1be0fa6e6c1692e4d91f4b54dd1145174abcc87a3bc02022faa. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/NLC8K1400126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33cbd4dd169994d7cefe9eec3ca3e96b699bab7b9ba2e9710f603b2afb03ea60. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/NLCK42412092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2424025d0883439accab28d4729dd8b20781cf5debf2153c6ceba7e432e770. 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/NLCK42415075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8630f1e1abf323f9450ac77cb7190cd804029ba1e66480598183c7a06779fb87. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/NLCK42415076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc7befc0f4fceb1cabc3eb9688970ca98a92ecddc76ec8bf3a6a6d4f3e6e70d. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/DEPI82444822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42d865615487367ccca06a624fba40c6b67af573a1e8093a6ee109ca6f6f70c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEPI82444824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba9a86a3f7ca4beb67c70907189269a70f57347ac884ddf8a4a909c42164a56. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/DEPI82444825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46f753b000a8ef4c60a4b29669bc05816915144271b7b2cfff9b370d1568de4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NLCK42502679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5975e6c1fa5a76239b2b4cdb550616caa2b5c2f5ac9ed46bbcaa1078d1b8f5. Chain 2 (Bitcoin): anchored in block 957550 (2026-07-11T09:54:43Z), 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/NLCK42502680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc650cb5874fb971aec05e39701278163e0564048a3221f9f6be5c68ec23678c7. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/NLCK42502681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df0594b470e3b55e5cc18054149c57aa8493c5470d8945033036b7412561f02. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/NLCK42502683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d7f3382380a3d29d581e31206e924fd41b879f1d39ccd7a1b5782c8b578d10. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/NLCK42502684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7e85075660b59888adea259be116c48a7b9abcb6a50d9f2a0bbe8a95048ddb. 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/NLC8K1400378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7476d2046b89ce04b29dead68126f1080d1c945503911258c831024b882301. 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/CH6542215629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43bd822ebaaf20b2de93532d2423f0b5c8884c50ef1a3f8922e6b2fb64a9d75. 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/BEN582100858.