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 0xe61566f554caea59f5027317414c69487bb367a9ca46e3e711cd234a41baf708. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/431b0fa4-bf0a-455e-9618-3a3a3355e8a0.json and https://artists.proofprofile.net/proofs/artist/431b0fa4-bf0a-455e-9618-3a3a3355e8a0.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 0xe82cb3ed6b92f197d8eb11855609769e7e689c435894bdefad4b297e9c457c42. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FIR2Y2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc975087b896831472b222c31b2754c6fc7e96919d2886d07ee8e655e98c00a. 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/FIR2Y2200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5084c43535e3280074662c485f2b783d1d6ae82932ddcc7d46ec56dc203fbb. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/FIR2Y2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5841f152b0db77e306b8cd7959be88bab268e83c04c134093c3daa08cb22a7be. 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/FIR2Y2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f300f9d5b35d1c7b451305da546b0d577c584be5b56a8b4546e093a63acfa8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FIR2Y2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16391171b40e0e2567e53b7b7ff509320e98226ab9e4df354c5abcb50c5e550. 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/FIR2Y2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa674c4fb995b7638013ed5599d88ffb3b84c810914551a186132766c37a2c08. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/FIR2Y2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784e13addc56c5234119734619fc932e13a767e27932e3c50206024a03a9c848. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/FIR2Y2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf53e12b864b9c641ce337713a01df97896a1ac2b23395432d4826862f3adde4. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/FIR2Y2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5faaed1a41773acd21363b477f82f1a58f1cff0500403aec84edd3d8b9353f86. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/FIR2Y2500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cae0271f0d6512ed44904402b637570eaf654929637b0f8fe4def1b9b3c48b8. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/FIR2Y2500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab1176ea5aa1ad9a77947d0197b33174c9a734ee9ba5a21609bbad021afdcbc. 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/FIR2Y2500049.