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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 0xc6fd694f3c1f9f3a62786280e9465ca06a5b3e6dbffd8ee7cf8d109821c242c1. 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/0eddcbf6-fa3a-4587-8a82-5ec9b96a30ad.json and https://artists.proofprofile.net/proofs/artist/0eddcbf6-fa3a-4587-8a82-5ec9b96a30ad.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 0xd816564060b43ec06c62e08a3ec085991137b5b0f6f42baeeffe34ea355ee850. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/DEQN41400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3cd1a3f4688c92b47ab8b2e8b71a313df2bb6f4b44afff2974b2e7392d153a4. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/DEQN41400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93330e937d6d574cf217563eb7daec11c03cdd1b52e209142e3df77fb077ce9b. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/DEQN41400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9803a296e776a98fafc592b15f63000663141e1f14f571d6260b4ae8758fc51. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/DEQN41400106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b49c1af3c27ff278f788add6928379abd167e27f5e5c630d91e42707eea6f7d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEQN41400108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce1de2e4d54685930f39f7120e03af9f68c0d1606f0fe8ecdb652ee61d0f039. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DEQN41700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763a3491d9649c2d7c853ef55d38876df56b3481063160a9a7e2d7f1a4b56ed4. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/DEQN41700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda8de3e4e297c3c489d3aa4afb0d22cbd8b92bd516bbd1db4b61d3cd5683693. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DEQN41700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddda32b931c0860712d30834c1b2432c1ff482632f825d3aad1e08537a3e284. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DEQN41700016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b14cea1a52fd0876c109c53a524037f095557a22ca38afe73b8142d69bcae7. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/DEQN41700019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c806dda5132b46d88cc0fba671fbd8a8d9301d27d0cd59aaae75fd23e5fd920. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/DEQN41700020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dcafc15244105ef2c02f6396ba8d3fe8da5bf5aa34ee80b4f6427428491ccc7. 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/DEQN41700021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7f9452b297878625c67674dfa117d1ddff0eac3fe1dd391c5bc03acc0d1015. 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/DEQN42000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076587cc9abe97b001c8dfde8bce589475d90aa636f9bc644c84bb5ba0135992. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEQN42000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1616391c9e2c5424b5c2a2f114e62b5e71dd9f004c2c945e90e10e8c87d0da5b. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/DEQN42000020.