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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8389cf8bc0f9906fd92dd425e6a8ac8b10d3c061302d810126d59dc126e8ea42. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2f2b510-293e-48cb-8442-fde86fb22012.json and https://artists.proofprofile.net/proofs/artist/f2f2b510-293e-48cb-8442-fde86fb22012.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7109602ecf66b6460b1cde01a9972ce18a91205012954321d66a84376a0c8187. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-16T02:17:22Z), 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/QZK6Q2057639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852aef45a0104a514b0c0be9973b7d1fef58ee898dad6de67571af966aa243b5. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZK6H2247798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e26d104ec5b57e0ee84fda30cca33b68c7b99aeb16358a7cd801c2f9e6feaa6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-19T23:54:38Z), 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/QZK6H2247803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31e976edbf265bb3356cec89877cdd048d41cfc9e06b5abb524d9bcadbfc8ad. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QZK6H2247805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b785f0b4f7f02e71c9655adbee66f077699246ee3e80c3c9be47fd11123c9e. 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/QZHN52406190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18bb2ea8cebcfdb4bbb6fa85b54cc377242f2916eb95909df042f8267672368. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T19:19:09Z), 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/QZNWZ2457587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43472be95da7cd77f099da30672b8f9b2f4c3569e0da21aadc8325cff3682d9. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:21:50Z), 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/QZNWZ2457589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a8220f2dab9d4190a242356b7500f2d0ba9520b299e45792cd0b0a93b8d5de. 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/QZES72570489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868b437b32efc4a1dc8985a2c1aefa951369c1fa2bb147f1b3ce2051ffb6945a. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:34:28Z), 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/QZWFE2552745.