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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 0x2c7be7dc286d40125cb645d80a1f5837dfefb9a310d501c9621ff3be63e6a4dc. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/74371564-b1c7-48fc-8ab8-a4cc2185fd8e.json and https://artists.proofprofile.net/proofs/artist/74371564-b1c7-48fc-8ab8-a4cc2185fd8e.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 0x70190dbbd7f02b6745940d4c341dea4bf4eb24fd684ee2990ce95f5e1b418c10. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZDA42247052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db6a12940eb16d061e73036412927665d225d332aa0fa8c1fce677df44c7a81. 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/QZDA72215032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7efed11bf447e80076ab7443df85ad8ef3a10e2671c1d6703b8a439ac4a60570. 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/QZES82291169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec2574e97da1d8279ba89110270e05c849b5ab9296115089dfd7500d996622a. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZHN32235618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac59e6ef452f797d65de2070038de47156f5607eee9a036bb6d46821024d4e27. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZHN32235619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc528849eae60cd25b1b2ce16e1864085504a3609fecd310c835a528fbdee9a9a. 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/QZHN32235620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df030c47158260d675bd15e0742b723fb6d98fb057273491c9df0f881c3067f. 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/QZHN32235621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dffe7053af002c1eb85c156792c0c81527aa9643e1451d007b513e1a13bf7d8. 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/QZK6J2490004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219cbb373656ae0471694ef094bef72fbdc36a3696e799f3f3fc56646cca3727. 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/QZK6G2305792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf193e44035ba539f559f420a5882ff2085bce032b4f54030a0bcab26aba107d7. 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/QZNWZ2351482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf193e44035ba539f559f420a5882ff2085bce032b4f54030a0bcab26aba107d7. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QZNWZ2351482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219cbb373656ae0471694ef094bef72fbdc36a3696e799f3f3fc56646cca3727. 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/QZK6G2305792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae686227f2d2bb401d3984e3e3fdce7af48065049244699c99ab4f11e276bad6. 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/QZMER2235664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb7dc74b881b1638451727c73c7b8dcca4504010461e25ee0799dd7586c5a22. 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/QZPLR2273423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae686227f2d2bb401d3984e3e3fdce7af48065049244699c99ab4f11e276bad6. 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/QZMER2235664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7efed11bf447e80076ab7443df85ad8ef3a10e2671c1d6703b8a439ac4a60570. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES82291169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db6a12940eb16d061e73036412927665d225d332aa0fa8c1fce677df44c7a81. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA72215032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70190dbbd7f02b6745940d4c341dea4bf4eb24fd684ee2990ce95f5e1b418c10. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA42247052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9cfc67b4d3cc50bfe235a9b4b13757664d2f1491cf830cc67695ec6ce838e3. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZNWY2168161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2180f1e5d7c6a547a773271458d3c16d8f82cf11adf74fe6112698cc1f1cbddb. 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/QZK6F2176875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c0445432eed6d2fa8f843dd0b2d239119ea5ca0fb33b658dc70d2509e1a9cc. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZHN62168552.