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 0xcabd6b546f51c27527fe0c0fff623d48b59cd54643199b7f6c99921081946a06. 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/36e16001-34c5-44b6-a716-80d209825f32.json and https://artists.proofprofile.net/proofs/artist/36e16001-34c5-44b6-a716-80d209825f32.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 0xfbc03ccd24997cbd95b9814cd40aa10ba16f4717e351dbed24fbe7b7e358ec3d. 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/QZMHL2027330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c11dc1f6d6fd96228e10f2fc2550f7ef7691d3c3fd3152cbabd3f9f19fff57. 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/QZMHK2059796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b7539ce498e8ac6b58fb05a822992b07663e0c2fd3e254fcf8c771ba32e345. 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/QZMHK2092407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f7bee130a12606ebe1c0320789a5c5f0c06573daba900a248e2e06c35fa30c. 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/TLREW2222234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dae222206ed08b71cd8f400fb16e17aa60634b33da44dab3419458220e58752. 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/QZVEM2321232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e1e67a9bad6562cc192ba30c65f8a5a7dd2f4b114b6e2fc7f9b5aac0ab42db. 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/QZVEM2312192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0eda59dcf28dd4f3b2d7cf191e80e0613f2261cb8f7ed4b4de7b5cb6bbf6a07. 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/QM4TW2312304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc718226214454facca038aafde33574e97aa1c3ccc040f7364425b5fe7083c6e. 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/TLREW2230224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695230a5ddca7d4567cabe0dd45bb6704ab99eb06c02d90b7ed94980c2d8c200. 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/QZPEW2228811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edf2f9762cf81b5a076bd0d2e7362ea27ab9fb0cf939be4b4f191850f92d51b. 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/QZS672186722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3579d98c898763c1812117abfa751ecda55151a6d6ad7719094c7f0cf8058257. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QM4TX2148519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0cf36cf997317381a88bad0a97d8eee675eb9b2b5954ceca2e09d99bf39b4b4. 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/QM42K2184296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089f39ad2addbe3b92f6d0556dcfdc20e98d9111455d8865170001664d10a7a3. 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/QMBZ92062309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a14963dcdb7c5b74904d61dfd8cb0a37581bf13fed2d1183fbed978f85aa88b. 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/QMBZ92062310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b4e9691cc33291ccc932e741f35c271a6675fca6ef31d0e288bfe474e26abb. 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/QMDA62446861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fcee0c8564d482b7accf647906e65d6b63976b99d88a6fcd823120ad007596f. 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/QZWFT2461198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ad832bbb05dc633907a8c2552936e4c690503f5f8cfbd2c43162623b90c5c6. 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/USUYG1196386.