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 0x2f9efecc241c9c0482062cf664371a0aa0ae3e906f770623ed6717577c005493. 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/6b9fb333-3722-4b65-b49d-9fd92366b81f.json and https://artists.proofprofile.net/proofs/artist/6b9fb333-3722-4b65-b49d-9fd92366b81f.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 0x266f2f052829f18dd801b607507d1ee738b87994b69efc8f8cacb95cd1d8ac36. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GX5MY2459209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147e2b48c9bff95b3b5a313fb528e63f6fa9b1d0cb0bcbc1271311e31b7be040. 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/GX5MX2301975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2dc6355f4fec864006fabacc84d194535c0612a7e79b9f67cc3ddab6e4df6c. 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/SE5BU2569294.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a383aaf55eafe586777d80e666d909f93c21fb604727da97a2df321717e0332. 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/NLRD52419177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e3817a3136efa833cf3588d3a410d82ba2fd30cb5a0b46ac41dc998588aeba. 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/NLRD52417704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2799ce7bba256c58191d47e4a665dd6b8a134c7b523b5b939a0504e816b01b0d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GX3HH2403873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86527a4eaa868d48aa8f4e87890ec92eae23160619e8c5710183f073f3b93d98. 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/DEPI82416368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f088c8b4bf8de2b172cd602c38a6b60c03bbf580ac5293e626d1784d899da8. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/GX8LE2486535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f01ffd7a8367133d5992de5db8d601de1c127188c3887ac6ffca95a7f5cd6d. 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/TCAIB2422040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e37f7544576abcf27ccaede06db18241f88c1f12f93eb13feb40adc6f1d84d0. 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/CH6542391537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14cf0de9ea67951fc2bff6354a49f180684af767173b9ba7b9660f462796ed7b. 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/NLT2H2300995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c93ac3dbc6952c590c860a4568dbc4806dd6d6e71d96ff7d717d5d114051ae. 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/DEYW82309732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec5f0ede444e841f4a01e46691efed8e9746533618bbdc17ceacbaf959c3a88. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZTB72323414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7afe204a4bbd9bc701fbf90ed28900ca94a0263ef8c73ea93fc5f81617643f8c. 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/DGA0H2358407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb41201b12ca89a5c6b2d03cafb5c8240efd9964288f4d735848984bfd13e2f. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ATEK02355400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1390ab502848a8ae4626541d678d38a4f99fc44789c0bf6651c01fefbfceb04. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ATBO82300048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25b1ef7f0b3149bf3849d8decfc48330e2149f0dca354663945544241f54073. 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/CHF032402391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226b0b6f83fbfb3dab0e9027f14002c640fc3b347f24420f929d4cf3815e93b3. 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/QZHN42310854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35db2fd9d94a50ac16ecaf08b5f3f66576aa60e1e2eaaa9d6bd3262eae83c4e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GX8LD2303934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8fec11bdb623233efdfda56556fb453437865ac877022c3ab9849ad1be28b8. 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/QZDA72121146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82869ab2865a3e33092d2a23887b64fbed90c95af4b90fb6b2e8de8c141d8905. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/GBSMU8090061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39d3c919d51de165498a919d6aec30a920028c49ad42bd960a88f7d170f2726. 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/GBSMU5889579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa077e6e3c20f7079c3414ca9511b9d19d19049af54a1e4e4cb52b5a9c8899bda. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QMFMF2310525.