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 0x9620a982014ca9d059d193bf670e82dec1fb539f988da77e3ea9d3060141f5f4. 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/660beed3-4799-4c9b-af77-1d6846634778.json and https://artists.proofprofile.net/proofs/artist/660beed3-4799-4c9b-af77-1d6846634778.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 0x111e5e2a3ea8d14dd67346de58bbeda14d33527159ff2e79c0688c45096d7d06. 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/USCGH2182801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7720d0ea2e55e720008a4fac05e2e2ef2c396a92cd48369054ba682b4957ad. 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/BRACT0300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e74351a7b5e3d20fe36e5f4bfc6ba3b253bbed4a37b4c05c311e870cd4b794. 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/BRUSA0402123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b011d72d5e08a0e0edaab08b6c313a34ec538515a16c1a652d69c3f46519170. 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/BRUSA0402132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a88fd0dbefad8105ba579f7f151ea954fdbb851697f265dc503ff11e3ab6f3d. 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/BRUSA0402125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff093f47af203838cbf4554d9be51019bb6fe5c239ebb59e28facb6032e3f99. 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/BRUSA0402126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51ac5cad018e26b30a49b85719a82555fa9bde34b5e866dd108866af6893ce1. 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/BRUSA0402127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb382f067810d4b09458548063e77e4aa905aabf0617d6c1b3f345eb58bb8581. 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/BRUSA0402124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984c92659d4bdcf7fc86f7e795d37fec359e31303243f46c764c5d41497f4964. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/BRUSA0402129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203e1e03aa36060a7d7c04807cd9b113bd7b3d843e32cb2f3537856f24001bcd. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BRUSA0402133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1bedb51b409634a7f6af385dc5a876309486a5670902eaaa2180be66ad0251. 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/BRUSA0402128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90084f9895e40935ae63eb00ff595a4c8bf295016d55488a2d1ef1e8b675730d. 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/BRUSA0402134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f77f8626d12b6b7344802b989509f36f87b9b5c402fb1ae4fadb32f04b91a99. 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/BRUSA0402137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a0321d3ca8a030243b1e7ed36d22ddca49b2a6c4d1e0dc161a0792e9231c48. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/BRUSA0501134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e74351a7b5e3d20fe36e5f4bfc6ba3b253bbed4a37b4c05c311e870cd4b794. 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/BRUSA0402123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a88fd0dbefad8105ba579f7f151ea954fdbb851697f265dc503ff11e3ab6f3d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BRUSA0402125.