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 0x00a4f5447a5e64946e09661d12130bdd370bb2c6b0b77de5f648b1423330e713. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05d74b1f-61ad-47eb-bea6-4a1b5a81acb2.json and https://artists.proofprofile.net/proofs/artist/05d74b1f-61ad-47eb-bea6-4a1b5a81acb2.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 0x1321258db4fec10df51891d9d29945e63d97b8e90f1d3e329cbd7194e7c4b55c. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/CAY511700110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8107429f8addb044697c9ac5ffdb75292974ed3e483f76f6476e8f5a41cf93. 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/CAY511700111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f09cfd04447ceceb21568820da3f842033f1e37a04c85418af46f88ba4c502. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/CAY511700112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b285e8f92d3ae9217f309bc2cfc91d1bbecaede32b53475bbecc05dfd2efa7b. 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/CAY511700113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1854154e2195639216a3b8a5dbf94f78bda8e30deb7abc49a8da30d5a394a1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/CAY511700115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528a961eb131432a7116a7cfcd7a338505fc30a3d237c828b3e970a7f552e7af. 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/CAY511700119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf72aaf051dfb32ceb1e8b99f62695484e14df672b63fa8a63d3742622eaa063. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/CAGHF2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486dba58dade24ff57bf81a89b29ca89f58e9643bc70687b9afa35a4e7392485. 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/CAGHF2300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193c0c07c6220daf757027406aaa758338f43ecf21f1262515a121540dce1907. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/CAGHF2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1ae19b08dce69eb73e5ddf740902f3a70bca6e5a8f8ffb02a54274b612cf41. 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/CAGHF2300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ba6b18861e1e3e575ec16e2e3509e72e0bafbf1af57ad2af7078568608e43d. 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/CAGHF2400086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464105343778611505bbcd7867e5e0ce370d55c5f5c0dafdbb3b183af8d21bf8. 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/CAGHF2400072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ba6b18861e1e3e575ec16e2e3509e72e0bafbf1af57ad2af7078568608e43d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CAGHF2400086.