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 0x933e8564bc030f2be13486a5e0b6d238a29316cb6e9ac5e5d3cf3b3919f02da5. 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/8aeb89c6-d97a-4578-9975-44ea74b80c8e.json and https://artists.proofprofile.net/proofs/artist/8aeb89c6-d97a-4578-9975-44ea74b80c8e.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 0x3a3855c515e51b0b79bf2e78341b5a92306caae1315ffe4195430c4738dc3805. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/BRT9H2000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e2f21c4645ba421d11325f512814a38c770f8e442887bafd9abd521da0a146. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/BRT9H2000056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8b7e358d8a3b38dd69e305ba0e0fa2482ed07d328f5ceefe48f6a9ae0b4f72. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BRT9H2000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7183c374bbfd6ce7952422655800770200b9f1cc9e1fc4dbec83afa1f9705d4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BRT9H2000028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0715782a44d67fd73381c75a582134e1ed69ec9aa56edc4db528f45c3147685d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZ5AB1883087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4ab87828e249c90905a8bbcc31e6b59e662264dc789c5ae547bd9f8b1c8cb4. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZ5AB1883088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbffa675a358efcc7c3ecf0f78f1fe738ae84d0b1b8e4cbc2b6db8dc459724066. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZ5AB1883089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e5b6a89cc09b1165f4537cc831bdb500668e7b2412df93fba8dfbd0b530048. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZ5AB1883090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f264de12aaac75570e21ce9a5c4cb2cb38df08c377b80b453b9c111c5834c9. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZ5AB1883091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d482240fea21aab0ef8756c3257b80c4977594dd245d3641c6a176a00e30ac. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZ5AB1883093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12782ea4293c64e341efe1e570ef67978e8e542768e85d54f9c13a5465ad605. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZ5AB1883098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5609f2918255ff9359fbe6c5ac0062f6d152c854e4566ba52eb3ba15917defb. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZ5AB1883104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e590a23dbecc76749539577234c04bcedeade115f035796ebf65bf354d35c7a. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZ5AB1883105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0298f71140433b6dc05f93114d8c70ce5ac0d1e34aa2903a51672d2fe2b004. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZ5AB1883106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb9c3d2e1a22091fb33aa991bec0aa5f34a1e751916a8186b01531c87bb192a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/BXIV82150116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db52d1a3f6005cf66abd12e2a7c968744af58ce844d015363cd9a790c32b5f4. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/BXIV82129902.