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 0x98267cf9945f425ffb411d1173b507bfc6e8e7d32f68634fc1e11a9950838caa. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c67f9c43-a3bd-48a1-8fc3-3750b9f8e503.json and https://artists.proofprofile.net/proofs/artist/c67f9c43-a3bd-48a1-8fc3-3750b9f8e503.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 0xa3edfbc99f2d103a4b58bc86588f4f343bb36b79cf1ae381ea7152afa5eca2f2. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/PL52J2518952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda32e86679e8035e8e20cd77e210f6371328880e715bdd9c04e690f118f699ea. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/PL52J2518953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a78bab91c6832c6b14d2e7cdbeb7f09082840c6ce0dbbbd15346df06725556. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/PL52J2518954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70214c8fdc87fb6dfc1e9184ba124a86aa1fa7b51c7210d343ab48fb1a3679f. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/PL52J2518955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35153cec54938b2a7d7e2738d22bf8614764c19f1de2c2ee949f8314c225aae. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/PL52J2518956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2e43a19e58d1e65ba009d0654ac246aebf915af882f718160b87424c0103f1. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/PL52J2518957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c65e89484c6f61d223d22c7513653a1b1a59355a8c9abf4d0132149dacf0f8c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/PL52J2518958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae80d70ebc589db6e3ac619204fa15b254687b2a42f278a3a1051c4d4994f3d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/PL52J2518959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f013077c75dba9cb14a3d7f104ce4b65c06705f6eeafd91e63238573e11b1ff. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PL52J2518960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85885edbd3d0dbcb2a76a0ffee22e0d06e11dcede2cb2ec4e25fc696117d323. 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/PL52J2524732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ad2433c4a380a1b15bd4981609aeda6679b64072458f14e0213d8731f4483f. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/PL52J2524733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203176c9063aa7c21c0090298e416159f817abc2766240a4199b62790cf82a23. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/PL52J2524734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9368975c94c0743988f87efc5a86f6ee3e20f797ceaf4524466ef71fcfaf21e1. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/PL52J2524735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13749a15c90b55c44d93f9e981567aa7d1c7176b1cff5ee4e8c9fe3e7c329770. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/PL52J2524736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f6eb0940a57a47add2cc3734c6ef63edde802ff1330122791fda7b60cfe582. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PL52J2524737.