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 0xe3008502a85ef358d66e95d5c7cbb98a135a57dde49361af1935f65c48905e08. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99be54f0-bd2a-4bd9-be9b-6468a3ca2ec0.json and https://artists.proofprofile.net/proofs/artist/99be54f0-bd2a-4bd9-be9b-6468a3ca2ec0.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 0xe5165ee32a24ab2bb315e53a11a46a003cdc94c698b418254cf358c0ab8456ec. 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/NLS5K1800077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce727022e51c7677720481d4d9934e898d8e241b87ecc31d8402809d014617b5. 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/NLS5K1700043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39df7eed35e18f128a070b646a9106d456d061940c029e55019aa6e111826ef. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/NLS5K1700052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21443562a4e729dde3e9691966a82b15d2c17172fee49e10db8ee467a0185e4. 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/NLS5K1700053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd051daf1bb37c2b2785e872123faa52be8016dab23921fda91cedcd778dd001d. 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/NLS5K1700054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05587c1b2f6e399cdd3391c0c9b8c49dd91f9a5a708d5dc473ad38ed273e5e3e. 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/NLS5K1700040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7db2086c190a06850f2b115bf97c12e59b34347903bfb44494075a6f0d61e7b. 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/NLS5K1700055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e2a86e096d3e403fa643a3ca996ff0a54b14a0d9dc45b1cea12b147e0d72df. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLS5K1700056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce727022e51c7677720481d4d9934e898d8e241b87ecc31d8402809d014617b5. 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/NLS5K1700043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe370612ed77bfc096893d47a7b0d63ff8d550df64feb4dbdb829b646298de46b. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/NLS5K1700057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa295c218966e2c984f2c17e2d31bad79ec0be57480a00904b48b157f3fdc1776. 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/NLS5K1700045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c51545b4a7ec6f381879b4ff229d6a96da8ec4d6d64fbab546fdd44d567df75. 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/NLS5K1700058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8c3cb8c6acdaadc86ab7bd36a3fe4e52eb14672924fd303cb9c51f2f182290. 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/NLS5K1700059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c672cb48a58b11d3e38c46ffc55cd5a6d00e539358b77170deb730bf85a2078. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLS5K1700060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbea8937f3226cfa4d7a977762775de7af6341a3fbf14c14dae1843e1a8d969. 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/NLS5K1700061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4518f647e490a2f416429f70acd7469f78b811c5550560afed41a4235642cb. 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/NLS5K1700062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc301b2cb2c7eaed546ce2ef1e19a816e238001c0ddf7693e58375a047404bd. 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/NLS5K1700063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33ac52af89b7ce9d59492335b66f65731577c0709a5ab3add3d12fd894e26f7. 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/NLS5K1700064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178b148331b063e937aaebaf99b9bb7da91a97ce2c6032b209ac3dab86808019. 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/NLS5K1700065.