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 0x4fd85b419dd0327786347ee13eaf802690167727c7dfa315de3869d995869188. 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/9c128bbc-6ef9-4b19-9acd-969c6be7cc22.json and https://artists.proofprofile.net/proofs/artist/9c128bbc-6ef9-4b19-9acd-969c6be7cc22.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 0x1d6f6acca28d71e00a7223106b305510079b989f63e9a380b393e5739e1cfc73. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ING130800479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c355c57cd3371c57b28e4d71f3893e9615602b1ee7e0831002fcdf5c0a243c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ING130800472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45bf6970b52264c21e5481cea237f2d9b099e70076f8ceaed05d0c8c282dacb. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T16:02:54Z), 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/INS929500298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f034878749fd353d64a6ffa76b5b1ea8a69c0f350188f005d210487cdceee48. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T19:52:54Z), 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/INS929500304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248e597fdc9a04f6bb8e874db1578089112d98fe40781b2092afe9b7d0bf07fa. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/INS929500306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b6ea32579d3221f946bc7789c18e22a638cf6fb61d0426a3c2077de03f6f40. 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/INS929500317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594e5781ad357a062e97c32c85ea23a53831b7f40098ecdbedc71c2eefbe5f2f. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T16:43:01Z), 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/INS929500427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277cbb7b4164ebf75356fc4b3e65daeaa0ab720fafc564bb6e0eb0c7846e3ed7. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T16:29:03Z), 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/FR26V2025383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b714d0c69b94b9bf30a094f8c85b834171505c7d743b29bede0f8a057cad0b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DGA082206162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa79a3703887dec4031d79bbe6d82148eaa5c8ecb4720acf3180e88f29ff4c73. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/DGA082206167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488e366057b0f33c55e50e7bab90a7ff503c1155f5015005b42b52cd966eb5db. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/FR59R2144901.
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