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 0x95d8d6c66d396ed9b69a0ad92190d731744b1d46a163d643f72494c4d3349468. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/95332d6f-7e39-4ad2-b06b-dc2c0f42362a.json and https://artists.proofprofile.net/proofs/artist/95332d6f-7e39-4ad2-b06b-dc2c0f42362a.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 0x9088987cced654cc4945aced0124dae484959944e64c294cb8b20ea3de7e589d. 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/USCGH1643524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99387dc4fc9567ba7b4ecfd4d17b1e1717371919327903bc9c2ee6bf2ca1be9f. 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/USCGH1643525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807d18a7c46cbdf8c5e2df2484a41c0879889fe06d8e93d51bdd944a01ac3a5b. 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/USCGH1643526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d619390aab032ab931d5303497cf268e5fac8b6c53534bfaaeec85f5d78ca3. 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/USCGH1643527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123006b50b36d5162dee16dae3421998e20c8e01ba22b403f9698102be7eda05. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USCGH1643528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa264a795cef2576c59b5290757acf2745b629089c1e309e5413308a2e6726a32. 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/USCGH1643529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae3b128009e9db530c7312b55329fffeea31411cf00834dd8c259b722cb8ef7. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USCGH1643530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05ebde782ea88bb253ea52b933a1a72f10be492df8ea8f3e88964e95f8429bd. 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/USCGH1643531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afa737a733be01c694673a3667138f3327fe66742bacc7d9498e57d73cdc58d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USCGH1643532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982bf715883b3b9c5679982adb243662953695823deccf6b803995f135678fd7. 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/USCGH1643533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e631f4faba807b5de86ca6536defece04884d18ef1cb61e8bcb60bc7092224. 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/USCGH1643534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc72c1edf83a21564361d6e812f870c89af99d16501078e65e0d1890ea2daa8. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USCGH1643535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12bffc01a7761c4e384840b3a0da858a62364224076b0353844b8f8d97cf17e. 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/USCGH1643536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e5c2f8c9155da7514b8b87e8115e7b3516b71fc712f7ad0f9686d6c59e5d9b. 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/USCGH1643537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ae4cd75c1a944d7afd29b65cad6595183a16ee923cfa22645419e11897a617. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USL4Q1836898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a8b6ef191ff08e5608c25c9144cf57c083b98a239b69ea530a44ee494227f2. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/USCGH1899987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60b228a6654057709773d34d38b7e8a06e644ce2eec6f12b54391704f5daff6. 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/USL4Q1702986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708db9db4f31a0d7eccb7960e55e66e94dfccc091d45fb1ae54ee35536bab197. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USHM91758212.