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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 0xfed484439893d14d2c983abb414e8a8a8e24fd2b989a73562734bfd9f8adc7bd. 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/75bf36a2-4d8f-4631-90c3-9d84f020af58.json and https://artists.proofprofile.net/proofs/artist/75bf36a2-4d8f-4631-90c3-9d84f020af58.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 0xff1da23fd72f1dcd6037cbe99eb1a63d0171cf4b86bc6a588cacee169857bbdf. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZK6N1924913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c0227b7d86961259efc06e4dffaf609291b56992a398ae1d7492b37a9584f9. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/CAC0C2000538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d195cac78bbeb37f6b4be936a32db97916b4db7279d2a9fe0aadc0013d53ffb. 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/CAC0C2000539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f99f9af8d9f6b8f7b215c0b728bf9bf4e9f2f435a6316bdaedc8101a9d541f3. 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/CAC0C2100680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73fd14f39dc76b8df38ca4667349378a2708ac58031d331611e8f8fd03ecbbe3. 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/CAC0C2200767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25420955d8cc6040a29978a315acdfe3f345ad79833f61467eb2f678353d845. 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/CAC0C2200797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769ffd5d5e6910a3c37f83ef5dfe0859ef0ec2aa04cfe028aacabd44a52024b7. 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/CAC0C2400879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a6b60807a6c222dbb802c159a59cd0f7867eeb7ec200e5e1e6af3f1a02323e. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/CAC0C2400881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464deecbcd8b22d2f60541c184f7fda146f171ea1f358339982121f277bad58d. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/CAC0C2400880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e2d380b47f1410ca500f11b18676664098bd533d2d08ecaec4f48717320113. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/CAC0C2400887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc95baaae5545111c178774f7689589df6dc88e1e2b5323c6a1677a0f331553a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CAC0C2400882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46924383985857a2c06e62db5684f063da285032cc1f38900a781c33ec9b6363. 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/CAC0C2400883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8aef365d4aeefaa5943af4afcde729b7d0f8828aaacdfccfc13adaba5459369. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/CAC0C2400878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c639afa41d9629e7d8d8eaa60956c8f8f1cda27cf7de5e390eda5c93d9d4eb7. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/CAC0C2400899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6de3c8a46961ea0640fb454ae42267e1b256318c1e916646834471cebd1098. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CAC0C2400876.