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 0x4c3fc03c92856e172d20a108642af3a3747c348cfc5fd1d3ad81ae55a12cff4f. 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/5d8a778f-2b6c-4855-a8b6-985366e1534b.json and https://artists.proofprofile.net/proofs/artist/5d8a778f-2b6c-4855-a8b6-985366e1534b.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 0xecd5533722bb6b621644b84df095483e8afd0d260c8a82701e219e5d99053359. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZ93L1949310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e077f572c8c6114fbfb7960df34e3c22a8a1835cbfa824d4d23da03a37c0d0. 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/QZ93L1958589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617fbeb33d65e46ea271759faa05af512d035e4eb2f1a68b1ecff1dd599b6c87. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZ93L1968062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36447f0e7049db967142828d0f8f463a88b0a6a1a77aa3ea15e6a4c71957ebe2. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZ93L2006444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef3f0123b0f0e1307dbb8efe5b050daa6a18294ac391834d93223f64219dc20. 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/TCAER2073686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550f28c12f642fb34c966a4f5419377dbf9368a26b8852260fad67ee6765afc7. 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/QZ93L2053050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59ce0fd0582fd5c10233141d30ef271aed4072a7706833d7b3b5e2e5e30f08e. 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/GX38U2300315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40ec47efc53d22940dade93cbf9f2b20bf4c102cfdb3c2eb87eb6e02fd05813. 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/GX38U2310027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ed7852c21ca83d21d2b86867fcf62c657022698b97582e52166d46f4e3ee2e. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/GX8KD2296235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286380b6283b7366da63157c3955d8d980e16de8b4ec7d38e73d91308c7f7635. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/DEQ022380578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c44f84f6bc4d5bcc1101d16a29a6743ccbcbeef447b190c79c51fa6dec77160. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/USDA12311059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd207016538833aba6ac5d2bb5a7337b61b5da6ab2bbaaa6fe69c0b8ce39bb42d. 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/QM3DF2280714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd207016538833aba6ac5d2bb5a7337b61b5da6ab2bbaaa6fe69c0b8ce39bb42d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM3DF2280714.