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 0xa8e6b0c21beed8a3deb550c0d062883d5bbf3e71e804e5c3b8a4694e4e4f4553. 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/f97ca4aa-46d3-4206-8518-9fa852c85d69.json and https://artists.proofprofile.net/proofs/artist/f97ca4aa-46d3-4206-8518-9fa852c85d69.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 0xc4387c9a4ab9ee23ce85b7462c16c73e4825fc5cb0854da7ce207a1ebd9e3b94. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/USHM81695031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2af684dbddda666ce3fb3c20d574a9597bf6964cdc0307fa43de5a56a6e89e2. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/USHM81695032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0655a6616febb80d2d73b2cf69ae1020f7f7943b3dc012b9ad1858a7d551fee5. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USHM81695033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd173f75644cdfdae96de792f171ff2ee3c54b74ddb35b37dc4e3b1425ed643. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USHM81695034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9a1ddcb6589e7f957f768876926d3a76ff1d67d520ae6ced8f47a39f79f5c1. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USHM81695035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f11b0045b6511d8af98ae914128ff538bba466e77002ca44bba81693e5abe6c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM81695036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c2d6ae091d27d11e7bdd99013802357de56a3e1a3ebd034dd5e915cacf79b8. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USHM81764563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df3981ba8ead68d75fa28260b09801d879f0885d3921ff07be6a9532854b7df. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/USHM81764567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786f0e8c9ba2531b21c3a0c4f312b6986df783ddbc72669a6f2cad2c9bf2530e. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/USL4Q1880088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7887eb11dd17cd620c44c042084185e4ab55647c43122defdde442e0ab97e0. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USL4Q1880089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232b9172d8781fe760887114a2e12a934ec851db483746a2ac8a433f68261357. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/USL4Q1880090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd63f3d5a12f2c3314cd7b915e088a3b377ddaeaa6c387e1d9aab8418c189ac2. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USL4Q1880092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff41742ba04e53003c7d158823d3f722d3aef40c33c4f10dd94bed73c5428ea4. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/USL4Q1880093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e11f05ed6d22e06923ae3f3e345d0ec663bf4bd5e093b11705e87eb7f989625. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USX9P2010111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f30ba0018aca397c62b3c4610f2b00cea748b758dfed6fe76da0401841ef40. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/USX9P2010112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097c4c001204fa1891ddbda7a1d0378b356782b31ba13231ef6a685bd6c2ffb6. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USX9P2010115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44914160c9fa4af5e037a7b99b51fa82346eea45540e8e6f55299a837b366601. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USX9P2010118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0870bc985dffc1ca4ad56b02cccaec0098f1fd4177fca9e6379accc334214f45. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USHM82181431.