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 0x2c29847ec8a7f1ad3e75e2404980a95aa35051d3757ef786cca1255c2e0110c9. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dcd76f07-6af6-40ae-abe8-ca69dc4b7eae.json and https://artists.proofprofile.net/proofs/artist/dcd76f07-6af6-40ae-abe8-ca69dc4b7eae.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 0x395f0884d5d21fbcfc39a12eac77ed99c818b9021f9e1d3be4761f86494337db. 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/QZMHN2218200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506eb30b6861a67ee1f774b4c8c9625ea423e90481c507b1c200c01ecbf58973. 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/QZMHN2287941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45863b9065f6b981a9b8496c79d4b3ca59b4f8591ba343c6fc51cd7b4d08bffe. 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/CZAC22303901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a140fb0448a29f9065d8130317146cbba1b4032acfcd0107d2cf03cc1bd568b. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CZAC22303902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc71c113a8de69ce3bf74a5da08a77af70e021bf46d891e79978322a7b5e691c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CZAC22303903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974f832acdac79d0688050e11ae9f34398921984525e8787a3f89606d8496704. 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/CZAC22303904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33dbe60bf9b68d1d918626328ad0bdc1d908623c09ab7adfc3509f9ebec338a2. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/CZAC22303905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f85ee763195d5c93245b6481f3393ecc4d0516dbd8a313fa897ad2714df58bd. 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/CZAC22303906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e34d3c7735b591d624f72207552127fa56b31fa95d0a6d2ba4f3ff2cc5fb7d. 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/CZAC22303907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990ebfc5ada6459c16f498b870aebd611148b90a2733cf2caf910f03b7bef728. 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/CZAC22303908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0842a104866003f8706e2bd09c776fd6b862b774e2df18a563b3a46c99e8d320. 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/CZAC22303909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc632cbcbc4bb08411d0afde8f596db5a182db0bf75cac33849d41577ae4223. 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/CZAC22303910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983a37652ea3a2bbb3b7b584f0740e8783948d10cdf4d473dbca2ed5fb4394fc. 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/CZAC22303911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2231763b707087e5a9b9e736e6758cd6c00f3a434a3fa6979fb1a72ca529a7. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZMHP2413375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da06de0952370edc8715ad4df7bf0cefe70e657a911919540c4ae499a81f526. 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/QZTB32505523.