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 0xe88911eef7d3d5d11fbb22e62b4684efa5b7c2f5fca4b5fdc77d0e9dff155315. Chain 2 (Bitcoin): anchored in block 954072 (2026-06-17T08:43:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ab4174a-cf5a-4d0d-8cc6-e58e25ac22a6.json and https://artists.proofprofile.net/proofs/artist/7ab4174a-cf5a-4d0d-8cc6-e58e25ac22a6.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 0x093f2919f6b06b9e84ec54c2f0d91e06186768555c6eec70724314367f838a24. 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/ES6102000933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0da9bb7987dbbba783e790d0ad66a2c952176c78809965bad0ce98c5a7bfe3. 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/ES6102000934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabeab7f2c28089af2db8f83588c837bb4cbb669111ed3d1d8a9ddd270dac3e0. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/ES6102000935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0e34a6cc7ad925447477d4bee3b1b8af2ba1dba7abee8c240f33d78a5f0ab7. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ES6102000936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x668be6f4a5df877e947388806aade75d77690e9cba82f4d43fe1136a397ca36a. 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/ES6102000938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd06f75742aa52c8dfbbb0630194d1f10aed329e229deb600edeaf8e6e1624ef. 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/ES6102000939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6e5fef8527d59e5f0e0396f40421b18b550283350222ee9bb0afb9c798d7e9. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ES6102000940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01d6f490c8110cbd071c6fceb352011cdaed441e3c6aebd1fb33cfe18abbedf. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ES6102000941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd562935d97c747434962fb0352606bace2434525c014b03f18c46a77decbef6a. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/ES5302575483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbb7fd67862d7365d34226fe212b79c31a8520ea74b2f4b0aac88e7afb2f2f9. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/ES5302575485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c0577aec52d6a9e7e84d11cd8afb266f80b4cc538625a6bda64c2deffe4ad4. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/ES5302575486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ab238a9145c974de60638411ccd115bb95fbfeb880962fc46e15e29aa28d14. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/ES5302575487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c6e9802568591250b879e75583704fca0a3de75075a7661ae6f7eacb38c2fb. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/ES5302575488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee2e51bc4fefc3f47d98b5964ec7a7b360ef1504339f851766ccee4b9f382cc. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/ES5302575489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216fb8aba05bf652954cd985a41cc9afb7e6183be8c8add129d8a01ee41813b1. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/ES5302575490.