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 0x0c12f9c8e7d44c5482ce56b669944700d33cf434108575e24ed98cf294b2779a. 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/a9e06275-7eaa-469d-8beb-9887bfdc4773.json and https://artists.proofprofile.net/proofs/artist/a9e06275-7eaa-469d-8beb-9887bfdc4773.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 0x6c63430f97b725048213bbdb4df4a3263c55d5f2d101330e7ecc8efbf88fb7f8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NZVS02100034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f621ccab756b317d5a00fbe8dba0d6ddab1e8805be3366e544280e1d90cea9. 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/NZVS02100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ea987dd170929823dcdc16ea599fbcf38c86d6509c2875b65c4934b4e93bab. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/NZVS02100043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a50b0cad4c143f8686d1a38260e19403f6cd35485162fee6d3b73a2e8b4104b. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NZPB12203315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8c6d8620d0f98441427110c18e6718385186df28d25002a4b437ce408ae5c3. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZKSK2163174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279aae82d854603c449c831056337a21ef90a55e1cc5c9bbe748b8d80db0d039. 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/QZKSK2163178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2fe0543d75b9f98889bceb9be97d7dead7f22b9ecceab24f04b64ea419e4d0. 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/QZKSK2163185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1365a5d631d06689a2e81b4f7b0662fad1424a1ab4c62f117d9148784f43ac. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZKSK2163186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8981b421fda99c3b5fd1f8a3a17edc89a5a35881a6373f184970d85c4c94068f. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZKSK2163192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d26455fd87c511b30b5bc2fe30a85a1ddf33de509264f85574974a3e5b5b80. 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/QZKSK2163195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf97649e1ffe38954f97e8e828f54e40403da85fc12c653c468dde573c1dba98. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZKSK2163197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0701e856e5e86a4ed267d9c59c554bb06603f29eae8b1421bab081257bba6314. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/NZPB12302749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25e89e487c14a13aab4f8d1993bfe34a20e2cd5f1e818b2e7faff083bfc9746. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZKSK2240110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc857c2d4905c97bb0023b8c60acda6646658e4a41943c056e4e4bc96dd0efd7. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/NZPB12202176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd529a1cfb64b010580d118191fa3277f5335708ae5fd2693cbf8376b7340f368. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/NZPB12203316.