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 0xefa08f9ccb8b77b7061a39543ac405d43b8a05c4d5001e8cdaad343a1274070c. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ae9c750-2ca1-4abb-8265-75fc00dbd8b0.json and https://artists.proofprofile.net/proofs/artist/4ae9c750-2ca1-4abb-8265-75fc00dbd8b0.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 0xa307f20d0dcfd219a89fd4d7accb53744eae1339781e372809f4793880df3b99. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/MXF149500224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a4c6af7a50d2ceb2cc779dc3265b28a8b0520a17cbb9d061130edd11ed8845. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/MXF149400238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa816e20f6110c1088ee67f0a4f54db4d33518274b0799465a83c9f845896b42. 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/MXF149100289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7f50dda58d291fb0b8857f36d910777c8abb253b5dec6756e34b069b9cc60b. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/MXF149300373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a460f4e04cc61ba5066452f5dcb6d9f0bd392a2cfa6aaa4758ad2dfdaf09af. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/MXF149300377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89c376445bc7900f7ae5a814e626c776c5413d8c8a7c46965bd88b0a4bcd769. 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/MXF149300379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2511343668b15668699a6bd5edcc3174750b4190576974eb249a40cd993576eb. 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/MXF149300381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10fac5db5a042bc338d39aa6fc14073eb2f24f03fdd1187afbbafa096436d48. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/MXF149300382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576b83deba7b981d62ff38eeb2d4d4e72ecf1866303d2c7fb915eaabf2b68c9a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/MXF149200305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd58b37ac79e1b77fd5497ce6472bfc9ebd91f62028373abbf14ccd5d7f4ef0f. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/MXF149200308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68466f8a192042dbcd94cb61999a41bf9692c22c66fe8725b59a63d5ebe130ea. 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/MXF149200311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8567f61109b4e94d27de7a1430df6ef73191534d70f59ed47143db97db3cc4. 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/MXUM71800754.