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 0x38a6bd9a4715822a107d518f724b99dd85da52b3ba6d158ef7a70a42180af302. 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/e59d5880-6dda-45b2-b0f7-3a5e08e293f9.json and https://artists.proofprofile.net/proofs/artist/e59d5880-6dda-45b2-b0f7-3a5e08e293f9.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 0xba2dcf45a390cdfcc3b86469d3d17cb04047508ce6e07869cdbb809d1409f245. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA62464470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6699c61dba2e067daba53723aa1f53c4be032418bd4abaec59464b029c2e971. 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/QZNWT2435799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88fe9a9e95e1502c56e43c93c01f5ded24da79bab6ce8fd24c40a1ad4c71fe7. 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/QZTB82485597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4088d9d6cfdf831e869501c5f7a6e935225ff70437d43956ebf3e5f1f9939e3f. 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/QZTBE2489928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801a062b93a6d93dc1fc1c03e89d77f9151ebefb2c234193882a8a3b5949b5bc. 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/QZWFT2433214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca90d29294ce87f0ce203026dc92e70b0ee976d5904d21fc397ce972be70381. 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/QZZ792401147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59001a34994a76ac1235dad62af90f72742ec28f0859a0e97effc13e135b6441. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZZ7S2409756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe596e8f126ce32b0db22b575a3a5736e01d6d81909fe1eb49056cb879a6da67. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QZFYY2533765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56dc6dcb3103530a33ca510da3b4c9a50729b8c47f7765ba783511b6900490e. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZES92500983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52875a9be1f8c5d5d36adf3c3b00584e25fd00b0066d4b1a01d100886f684ae6. 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/QZHNB2564581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98cdfe66ed7f3d41b14c29ab977ec1a822e8405d41517656748fffb294709fd. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZMER2510721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93d5a46724eeba72d1f7b5e87be692c833fff9f2fcb0c1bb90bf8e745534336. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFT2533399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ac18e03dfb32b4b24030a93041b3e63712e1dee2903c033445525aa5e005b3. 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/QZZ7L2542817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6657ce202d7a913e61325444d1782d4e45def6ab0730f17b791ec3448c9d5b4b. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZZ7X2512139.