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 0xbe25869e761e78a142d065394cbc78ebdc7d783c74e0edeeb9e151c7dd9b9920. 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/a5ee716a-7598-4fc0-9fdf-72b120d84be0.json and https://artists.proofprofile.net/proofs/artist/a5ee716a-7598-4fc0-9fdf-72b120d84be0.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 0xd0f870179bcad6f1f5f3fd10d14f6bd5d2708affe01e5b629054dcb6a898f026. 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/GBSMU2210708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46d89f557876db793cf41f0521e8288a0cf222288079120e868118fcc4ec732. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:35:10Z), 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/GBSMU2931273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156ca5e19339b3244dfeaa6e7049a9acfd1aafb671e2c11a2bd9dbcecd5fee29. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:34:22Z), 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/GBSMU6041870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7e5ec887ccca55ece0cdba6e376857be0dfa64264c1badd9c7e93f7e7e5a12. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:29:04Z), 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/QZKUS2206846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58fca08becbb479ac6b74cc16eaf190c4bcd10257bbef0cdc3e2f50a5d75f27. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZFZ22387255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb6f349758ca538ea8201c2552eeefafda721c4df5e04a1c526bd1427351b3b. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZES82312391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf409b02eef19f188ab990f18818ba952ea13fdadf511ff7a31d5250ae94439c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFR2430261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba687e74bc85cd54ac4291f3a0d7b0f8832a1c272cec51f394cf55883ec3b34e. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QT3EZ2466068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e7b31f1914e3a6b7bc75bcaa177ab3971d24ca714dcf6c01bb8b584535bf2a. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QT3EZ2470064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8d158b43cfe38a701105f93f02607a902c861fa5bb267db578a3c97a23fe13. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QT3EZ2497906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92002ec3d466ab671b77a4a4e698873092394a76ef4e9f8413d08e36d784795. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T20:37:58Z), 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/QZDA72520798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f66b5e3d54d8c573831083d23afdd1e21660a77d0aee1134c07c05a41afa37. 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/QZDA82561358.