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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 0x06ed86e3c061d59b84e637512cbcd7c1d7c7770671bb5c38cdaec75d464fbfc2. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/70320fae-2d9e-437f-9cfe-fe8ff62e0f7a.json and https://artists.proofprofile.net/proofs/artist/70320fae-2d9e-437f-9cfe-fe8ff62e0f7a.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 0x307a38ed3adcb0c2b796e20c2738cb1539028f02d40e2fb357cc7352cc14de13. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/ITDJ72200066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc9149610f948a7294b6828b15ed39bd20617bf0a9c51ba18a01b14cb9640e1. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/ITDJ72300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885a0ab840c61372f1e87acdac91feadb0d3b262d01e0b6ed0d0defc625be3e8. 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/ITDJ72300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2704675d10dc69dff203596cfd8d9b6c8cda4cd3880b71a3f845a437f421ca78. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/ITDJ72300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e20ec4cfd68baec54210032049956b834d4668282126c56c07210232d2dfacd. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/ITB552417244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f446abddfbf41dd722a2da808bd7a67ef5b920ee6d4d623975f3d064f6f2f93. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/ITB552417337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659fb29627b4f562ee3dcaf4cebf09d30344ce7623409824dc1e8a767d6f4a8b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFK2470454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4b06fc76a3c3f225d3abad9b4b976722f7b235b5d6fec13dd80801dc4729bf. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZWFQ2425242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b08c121ae3ad57d085acd1f6d30625285221b058ec589b9ccaf82423b0544d8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ782443339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d4b5d795a4f7c366b5fafa7933add8a3a6a1d31823a655ddd7ec460db54ba5. 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/QZZ7X2416351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190233afa7ba99714b3193b23f177b1eafb7b8bb71418be595f1ac62005af115. 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/QZDA82532940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946b3372e602048d47270134ee55b3ab75ecffc5e75b3f8a3096f6193d5ca760. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZES52522376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6d8f10fcf103d36533fac76fd0d47599e67bfd76f08f520ca81760d0d90618. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6G2568300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9164af0228ce12fe171df9b67a04100f43fc73ef0df1802a045da1ec454b41. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZTB32548398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7af444ba9449c3a539ecfb916807eab7d125cc83db836186e173d0efa1ce968. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZZ7X2513049.