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 0x658498095ad34cb33232ccb4f534fe7342a006803b1ab8cef56fc9ac80493f15. 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/552acbe9-cf78-431a-8ed7-d21c71a60f99.json and https://artists.proofprofile.net/proofs/artist/552acbe9-cf78-431a-8ed7-d21c71a60f99.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 0xdb61ae24abfd294e66b9bf2a321b49832c7c2ec441650ce16c30d42e3b4e920c. 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/QMA5Z1400472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088d2a76c4715fabd4d12cd1c451107d37da4d325849df62129642717ff79479. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QMA5Z1400473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944a23392cad045847e53c5b0df74980088e5c704375437e62c52db8a04b3e3e. 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/QMA5Z1400474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf30a92c363b60da5a4abde748b92ee9147eab5a7e9fd1d20c5ab9c714ac29f9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMA5Z1400475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3873659c9cbed0cdd5df738b1c954e39f19e2b110ba7da87ef7b0a508e2249e2. 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/QMA5Z1400476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9322888c452e35482cadaf625fb1c0b2d558aa532929835636b340afcd731e17. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QMA5Z1400480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d92f2b8cd24e5c68a1955fdd7e1e6bac65fbb1aad65714c72ac27ca56fa33a. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T16:05:17Z), 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/QMA5Z1400481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4306adf9cbe68404c84feaf655a68bb1a8da337ea95a8d852887c6b7578280. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QMFME2306952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7bd32f379f2a1d925e37eb6c6051d4686cd42a2157f8a647264f20aa9bc93d. 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/QMFME2306960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e9d2bd51f27bb945a212dab41fc064251a25ece9acf8a4d89a69714f065134. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QMFME2306962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d48fcc57ceee3b2a59f983c092ac0f7758040f4c5dd72e74b6ab60f19019f7. 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/QMFME2306966.