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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 0x1e44def44498bda3d7d8d50f5864a970c25c0a27db5834980ee0b8d3185df806. 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/3b895fa7-af67-4e2b-9045-913c3f2b176f.json and https://artists.proofprofile.net/proofs/artist/3b895fa7-af67-4e2b-9045-913c3f2b176f.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 0xab448cbeff3b7a1ff97632213b4f01f94f94c72c99e8ef19507e8b733173e31e. 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/QMCE71300601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19de3629fc1c4ee0ff6b61f343e1f6c6cbfdef8482e6bcaf3e4a239ed795edc3. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QMCE71300604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad233571454e3bbcea8f8ff003e91166207fdea3a2ef0fa20b01dd6390ec13e. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QMCE71300605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbafaaeeea83a673a43ef55e162ea122406569e72c9178120ce43bb72ad2c6123. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QMCE71300606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3128108d53333cda6bdbc20e991e4b5d161cc5e1701302b7aae0454b5ba2128a. 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/QMCE71300608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3afc40964ad95d8ec8262ea3728e0833e7218425e5890d369d39cc09c10aae. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QMCE71300609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb063512c803a0d73dcebe37a50a5c54494064634e9b0807b2468831f82969403. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QMCE71300610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd937c4448fc9b286f5593d526a243b54e080baa74a88dd65f668392ad850d59a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QMCE71301218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9692a1712a06cd6eab99e3fe7224f67f935a665c1703e4f5b638bb0373ecdf3. 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/QMCE71301219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f0f9a4dddd73f61eae5c750ff04b116631dfba521ce46fd8dfec2f74ae7048. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QMCE71301221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82052689887aceee3f7ebf318dd5609995d9ad0a7335d150f5fa4649bf814ce. 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/QMCE71301261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa590480b289821fb56cb87a249c26eb0b3e53147989606f828e54665959aa842. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/QMCE71301265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16d44c82f82172187ca6b95070c3d273a798491a8ab3d6120fb3a09fed9e138. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QMCE71301266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09b1e2e5b25303f0f12cf71e1f61e1e3e715117ec68b534e116d9be619a066a. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USA2B1802953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386efa43d806db02b88380ab4299632b63012eda5f0333dce0e856001f5901f2. 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/USA2B1802955.