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 0x93e989f4de52e5302daeae88a809dfa25bf1c77c3c85104bed6054570035d4b2. 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/23ccf52a-0452-411f-9e1b-44af37924a20.json and https://artists.proofprofile.net/proofs/artist/23ccf52a-0452-411f-9e1b-44af37924a20.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 0x212cf31f5ebd1440322dd3e1e06b5aae527f2b70984045ed52d632cd78067d63. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWZ2020486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56baa0572222e356b18c5929945960b263034d98b8cec0d382e25346f47b0da1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GB2LD2310085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f489f0bf4ea583af957cfd702c812638ac18f9b00dd24a7af1fba1b334b142. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CA5KR2319974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799d1d09a014a29e28c43aee360c1968edb4a567ed32e6b8117b8fedffeed367. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA5KR2306012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b2e67f68bbc6f14b5d8309f7cddb2ed2677e570b56756ddf4dfc6a2fa5bc23. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBKPL2283260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789c3e435b56611737ca44c6346eea8fdd8888a4c55bd9919f3c29f97a12bda4. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBKPL2283257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8071924f311f553429377c17cb5da3b8f5f633b916c697956d024e6756275875. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBKPL2283258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2e08f59eb813a7703de01c67c5bf7bd7b0645398a876cba03bb6a5f0e39090. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKPL2168682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f82385bcf1ec51df5f5e64b4d6e809b26115a213da6ed820f35760951a926e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKPL2278087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd289d084a8b7e3629c47dba9a41a3ed79a1d482611089dc588b0a5d0a4a3f7. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/QZHCR2000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361b5cec12c4f6d87a559911ad3ffe75c2268085d93b1a67a94ed5096b734e28. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM42K1977351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f2596dbecee99a509ef7ea1f52cbb3ccc98924840988f83c7b76871a44032c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMEQ2047784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a2051d61e5bc16bbe749dfaaebd08500c4c471f33fb12608f390acd4d88e9b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA5KR2382861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6757ad2a8d9906376b4221477a257ec61308fa8824642453bcb51a47fef7cec0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USA2P2201931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58dae03d900700e951a84aedfa8ee5643eca6886bf0928172cdc6752dd95001f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLRD52319394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799d1d09a014a29e28c43aee360c1968edb4a567ed32e6b8117b8fedffeed367. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2306012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2e08f59eb813a7703de01c67c5bf7bd7b0645398a876cba03bb6a5f0e39090. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBKPL2168682.