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 0xa1d86e90fd55edd2b2533bdf556508168ec4fe867d4a67f4898e722b991549f7. 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/6243a58f-e655-4b7f-9fcc-75576e2fb848.json and https://artists.proofprofile.net/proofs/artist/6243a58f-e655-4b7f-9fcc-75576e2fb848.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 0x77a55ea737628c27752865e039323e0e0d8a0a84cd44639028a3f617ea96db73. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZFZ22008275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2547a13cf55df0e5298057677d539354e34eacbaf527d31eb0a9be70322388b9. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZNWW2082453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc812b04586c36fee03d1e4907cb495eea6de7a7f761ef44c00a5e82f667a67a. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZHN42142385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855a00c977139c031badc9f74dcb0e532bf1060d8318180850f4cdc7de1ffec6. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWW2191432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38eae2cf282da5bf6e410b93e953c35452b7d473f4454310dff4fb726fed0a7. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZDA42275058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df99df649c4cac858bc0be7e9f6a7c5d9da9739687de4e9ee4d32bf5c5631a5. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZDA82283338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c925c54e51507fc3651bea889a5e8a661a44728901ed72d2bd32b17d5bc69f1. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/QZDA82283339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794792289c98566c6564daa6e3e094d83fb0b4cc5ede0f5345b6e50ce1c52626. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZK6L2211928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75df6ec56040c53e9ff2252908928cb87ab52bd72225b0469cc9e64bc5c455cb. 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/QZK6L2211931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9a69ffdc2ae1ccd2ff01c507a0cc2a67e0935600d0f4d7efe9e7c71966c9ac. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZHN32353854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb406cdfea914aecc2ab5f2826628ac9a3c3b7def98f1e1176b6bb876c323b0d. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZHN32353857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d604c11b23e7dd29e69eab1798ea4f342fe20cf4a9de48a7c07e58fb858d092. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZK6G2341541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267964cb404ca8d307e572d81eeaf566158c04b8c1238f538ebbca695acb69a6. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZTBB2325939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8beb61b7d68ebfbc79e75c7eb188ce4b59090a28eac6e8a52e40b1f095a3a8e. 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/QZTB92255468.