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 0xe94fdc57b5ff7babbd0f5a518293f86d0d329eebe39cdf17c62d3c13c9726e6a. 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/e25660ae-4fa4-42ea-92a6-f94dab7d8824.json and https://artists.proofprofile.net/proofs/artist/e25660ae-4fa4-42ea-92a6-f94dab7d8824.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 0xad19324037b57e0e18f1fb4d322b82fd8e33baa77cdbc201525e3e9d80edc997. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZWFN2345405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2442edcf68d7a534ff46f8a10699f48c604944f143b8c1451a7ce58ae2b84e66. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QZTAZ2484018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd967f639b09796ee92983f6a919b331a917c8fdc714c3820ba39c35d37ffe23. 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/QZTAZ2484019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb011c534bf54bd52c18b04204bf7633db57c0e89cc2ca3e27c94e0f45dfc3f34. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTAZ2484020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3cac8f9b4f1f05bff94ce08ebe5db1514563e00611a94c1b0febcf74c05bd8. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZTAZ2484021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6874bb1fc9995a2d8e9f21c7c851101e6dce4d5884535d1fa5541511f7049eff. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTAZ2484022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070637a7f46d3181b107fab1a3ea4444baf00e830b28a85d33981dc7bd8bd95f. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZTAZ2484023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737742b3785f3217a76c76d0633ed75b6ae3ef78b17b820298c44f483cf7d1ec. 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/QZTAZ2484024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8449de9e1362e7d6e5b0d64267734a237269718ee8b1373fc1ae502afa25174. 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/QZTAZ2484025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf36b24f53174f98a9c0a950e8689c07e4c93effe2fb55088a3150669b4d1988. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZTAZ2484026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561a2660a18a1fe67569aa9c03ebf18430da768e0773f70e80176651a0ea6b13. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZTAZ2484027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4620807f0b50eb6a73cbeb211d1c5f28be98f61f34372840a59e6a5bf52b2481. 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/QZTAZ2484028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc158962827eb96fbe48a8f31bf2a7d524ced0d7b5e2200ea603c689661724547. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZTAZ2484029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4ca7f4cf68138b89ae1181ff35cddfbc20813b73ee9388270a3de785f3aaff. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZTAZ2484031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38524f2c4f954acef5af79c63b59e59379ba0f70f10eeaa4e4568d71809d8f8. 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/QZTAZ2484032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c50c8c7a7b2c140f7bd03aeba6a8317cc530fa20430b554294aad7959912c7b. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZTAZ2484033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb040e0c837a932ae149cc823d7b074909213a86bb9ad4753fdee6eb3d25495. 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/QZTAZ2484034.