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 0x5e424f4aa511fe2992a3302ae43e7152fa191022f71d9219b337716015bab87a. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d02a8bb-6350-40f8-be7d-4521e8a08d0d.json and https://artists.proofprofile.net/proofs/artist/5d02a8bb-6350-40f8-be7d-4521e8a08d0d.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 0xffe11b76659e1ee58df057d12a840e8d22c0ae95997721ba125bff088677b19f. 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/TCAEQ2008232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b2f3a42a451b172cf8134e69354d4cdae668dfe2f951a2885036ab0544fbc2. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TCAEQ2008238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583f3b368d2cc85f9969b54d7dc5a726932d69a2e0bde82359135877e4806e22. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCAEQ2008242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6260112633c023d68c9f91bd3b18612d8b011a093d5d1d1c6d572df12f249945. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAEQ2008246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33509aa3cf0663d74499ef96786d7d81fe091c700ec70c576ebf42204d5c728f. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAEQ2008254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d41bffad49bfa2da0b695df7fc48d1fc3ab98aae6aa137fd6f7557a2a6b8490. 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/TCAEQ2008264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bca6daa39d545ea6dccf438b5ef57ace7ddb0f8dcc674099b16e16329fc4972. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAEQ2008269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf578addedf1c8d878923b39c6d249b98644f896c69b748a1e388b73498785e. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/TCAEQ2008292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0506d3ee26c933f5157e3515af18f6a9f95a3c86679c8a52fb33286b16b529. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAHN2352347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41028cfd5a0242d2e34708ce275447228b75be7dba2c642deb918b2d1d3a8908. 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/TCAHN2352382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3508c25f2d7b8f0ad3da0f4230796120ddda405a83c0efef2d18b66a1f4ce0. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/TCAHN2352426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1748af0df5f14f64e026ea86bc5117ab1a80acd419d04f40412323392c280c. 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/TCAHN2352451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01272e0dcb35cc09e78c79bcc98d6346e526fce1bed449ffce5faee9def8d32c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAHN2352477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046021cb42755f877ae8836927dc6ad89fb0bd9bf067f54d59c8ed5aee85a0c9. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TCAHN2352547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406d947ec469006ba0a34e843fca46e7d5448f0607b05d58c350dc849906756a. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCAHN2352564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386a6e5e1345917911b45af19e87f2073d37fb5f6ba8e1339da8bfb33704d03e. 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/TCAHN2352635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1832c77f59d974daceb6a1bbfe22c62fd31406a646f35f5a56b54b49f87ffcec. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/TCAHN2352759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93acf69a5153654026e47b868e02b9ec35e01d12f41267c6414499a4ac2744be. 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/TCAHN2352831.