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 0x757762ea8156105dfcb3031c49ae68a5c95cb4e8f0f816378e6e1ec8a0e21426. 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/f2a4ce7b-e790-4115-9643-a6a0b7787767.json and https://artists.proofprofile.net/proofs/artist/f2a4ce7b-e790-4115-9643-a6a0b7787767.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 0x26c34b81347928c0d15f4c84c5a67f9b023bba0b3f3c4677cd8f09fd888d23ad. 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/ES75E2307775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5de380a88d839003a2b8e4a4a2895924c6805284a4ac088ab10f9c0b1c1e9a0. 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/USL4R2376504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c27aa235fd005a33c39d11c773b70051a9e3c0983ac75ce5f40f37c79101da2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJX2309621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedd30aa784f4a827a7269a373e040940943111f9a2aeb89aeacff32dc098fb7. 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/QZNJW2470095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65278e7760509c05b12b766b1ef80c479fd97f5a4d57f04420786091679cb92c. 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/ES75E2402409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7505121090b0156bd4acf66fb290b6edc34142186719a75a5a73e791c137e78. 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/BK4DA2318770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2511a624541a48538529c923d23156a198ead525d687c1cb86276cf8bea680f9. 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/GBLFP2391181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e81c2d1f026577dfcccd202a74fb965726057ea8b91b51bc24f175069cb35e. 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/QZES82430498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58154341ddb3415d82caee972edecbb4c8698dcd5b4323a1a5af244a90c21d0. 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/QZES82430499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23620353a66402c8a37207c88b94efba19c3e70496b2da2926c09a55f0e8c9bb. 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/QZES82430500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f7bb15139191b6b5662cf91ba1056c6811edb7815e051f3cb7dd9f2136af69. 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/QZES82430501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0315f020d1828b9ca7400dba7551f0edaf3096f7f8cea235309da256d1b901. 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/QZES82430502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc96e107bc840656635a6201314f654818e64b127b9aa43194d272dc1546a9c. 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/QZES82430503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47088e619e2e065d8c13edcc5a0ea43c3821c28ca736c7ee430cd66304f47841. 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/QZES82430504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4308bb9e3df2e90c8e12693a4ba649c0e5c380c30b9f8c845e78578fd75d0e. 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/QZMZ92422944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f91851f4e279fd995ec649591a101e38c5502e5fa92854206299196c2a911b. 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/QZMZ92422945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fea1ed9996ac8a1654a48983ab41b9e32d0c051fe01202f017e6934be7f8f5a. 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/QZW9L2353050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626b9fa1bbecd48011ea107e9d2eaf9538bdd5f80c64c53926573960a4d2f518. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:50:48Z), 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/QZWFH2390952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8684ebd624cba3a565ff75cafc6a5b1c3613c1a99512b19a61af61557e08c8f3. 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/ES75E2411889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8f551fc41dcefcf64b75674ac8ce7d324e174e2d26483dff05057e75c9911e. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QT3F32450944.