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 0xd0f0f74105e6151c849baaf3cc8886719834668a2df9b867a2f5b7e1b1d3a801. 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/d9fcec6b-4043-475a-b408-f091916edbcd.json and https://artists.proofprofile.net/proofs/artist/d9fcec6b-4043-475a-b408-f091916edbcd.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 0x657c0145d63ae46a74c1fa1e782b8522347018f6236a1cc3aa440b3bb25983a2. 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/QZTB42203429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6276325e7c4560a904e021f239e33bd0053ea0ec29e8f34e988da1c52a5433d3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTBA2337561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95574c681b8c57e5301f7de13d876fe87d379559427e16b4789b1fe649a61725. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZWFF2321878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5761af9e06b0035c629abc4bc5e2afa6ebab78d15d54f31a7842a543e426b16. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWFK2356923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x977b146e1feeba4d1cc0c0c45b5fc8f5db7e910c435c45e210bce28822adbd7d. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZWFV2476286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4515127ba973fa341c45403b2012318cb47c2b7201bd113f36925f171125ffec. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZZ792475715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d9ef8f9e4ae61e5f0635448d7292f7b24e36ee482d09856b1e2f49f90d56e9. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZK6N2505295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b043a29a6b463f04a1b5a80a9cf55785e09179451adb2404e06fbc95761a6e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZK6F2527062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7d3e65a4c81a0326bf48acadd7345223b5a2128a4728d8985fbd015ad35bd0. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZTB22582488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4021bcdcca882168c96128b381e871b765adffab0850d96011f2fa9ac9c184. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB62562295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9764a3a593e7045d7c3c8bc992ec35395d6a0b7ab8ea3de52de1d85beea98e0f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB62562296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5761af9e06b0035c629abc4bc5e2afa6ebab78d15d54f31a7842a543e426b16. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFK2356923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb598a5f63c4e2b9ac453412b8813d15be48772c33db27c811a7beed1561b2db6. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB62562298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260fb4c215a43df7c1081022af4df6d4a5d900aa740f52225f7e5d6d0a4f6ac2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB62562299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8093bdcd115d54d3eef5eddf25c72c1f5a92a4bf97395b0ac980181535b28ff. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFU2539810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de8779a9050ec0389530a2528f9d05e0ff3bad6ef63c03aa9b79fd6620c9ad4. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFU2539811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbba1de221f09fbd7b64c2d60ce612329b39c3cddd4699c185867afe514f4cf2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFU2539812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d00a1c13d630c4afeded01d80167e46d5c1d79ea76acf9215e3b56fa7b7fe63. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZWFU2539813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de8dd61e3e62b590b38d4d806f3569f29a2e71cb8b02fbad9aa6a9610ae4da9. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWFU2539814.