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 0xc40ef63f67156dce2688b88f12dc1b293429a97e6ee92c136ddc7d6e5582cef6. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ef69524-3f35-44e3-b07c-93a927658832.json and https://artists.proofprofile.net/proofs/artist/5ef69524-3f35-44e3-b07c-93a927658832.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 0x7cac7bd6cceb4785088acac6535fdb2fb7e34b1193b8fe29fdb6e27e9e3e33b8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWV32432508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2a39845dc9d5da249c867cab44142db600b10feec534d78a65b014a8e0c632. 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/QZWV32432516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca060f3c3968602571f515a1179b84f777e0db1c26432d8166524a04685f8363. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWV32432526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24464364c93b2ae091aeda7f061807c4539fac93532ae5c721966a5b7caedcc4. 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/QZWV32432532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6673b0b24b3847fa960c833159708e2c69c5c32f6da2d2073b4049ef445b6326. 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/QZWV32432542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4a2b11ac061280092cb995b9a918fda025c80790ed94a899106fbe8acd6d56. 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/QZWV32432550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35c149c5927e08f6e3302694e9d14ccf83bf5f880db04be51664b4eb9c6114b. 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/QZWV32432551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacbb113861124e4991b2ecae3342b9c0fb27132c63578abab5d17094c43f699. 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/QZWV32432556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cb40504e53e7b6deb707ed439a30770cb8cc624bb1478c71e16afdc2ec45d1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWV32432565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93164e8bc9aadf5617c8d601513c529b313c4483ea04e2698b378a119de8af99. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZMZ92366950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe2b4b7ec15d33c58a44d40ee5b52852c75b040b1ee38fcabf088ade12b8f44. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZMZ92366951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088e766fbb62e7963f17913fb765d27ff4414f06c3e0875762df09305ba4fa5c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMZ92366953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efa106d8bad3adc52845a3ce9ffe8fa9f3015a9aff2551496de116504fc954a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZGLM2444645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a75bfca51694cc0704552bd5c04b873a341a1342a3fc73c158439c8f6e4ccf3. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QZHZ32250583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbadd56dfe7eb774532655df24f37d9c8db163ca5182e4ce7d06735163caaed8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEN2299679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8315a8db36f8583ab50e828714e8de0c9615a56a3b51158d90393d96cff184. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHZ42288719.