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 0x2406c179c6d21452a5e4f66431348b249e01f5178df57f37eb1064f7f0023663. 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/07acbf34-ede7-4450-97e4-984a1bd0764a.json and https://artists.proofprofile.net/proofs/artist/07acbf34-ede7-4450-97e4-984a1bd0764a.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 0x6356ab9714c84ea03e1709f8547e6ddcbca1701fb3a83ddba5e9a9b0f92ad00a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZBRF1848363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5f043c15ff35dd6c3eced7b352b5aa45d276ff2aaa754136e9fb8ba67f7813. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZBRF1854009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd69e2c5526db86eb060b68a9a493f4027a3d98458fab361512c285f333cb380. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZBRF1854011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105121342607ca130ec3be0813afd5ccc80051ea9e5a8085c0ae17ac194e6e7d. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZBRF1854012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19cb0e892c04f899aad9d4db66e4cd898740b3444d9a559076321cf05d7cf952. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZBRF1854016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc433d92e2507c1ab63e111453b02a3f45412089eac82f23cb16cb65b076a289. Chain 2 (Bitcoin): anchored in block 957695 (2026-07-12T11:16:12Z), 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/QMRSZ1701344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad8f6a7997b9bee4d3c59878b9af7dcd5159f5ca6d11e1aa6f79f5967cede71. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QMRSZ1701345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5083c90b50a6bde214b0abfe9c616b27b2a3264d1c64f9e107f552a4a56f4375. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QMRSZ1701346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d45976c49e92e9cba116796d2f1873869f5269c58dc08d9204b2c4b3687736. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QMRSZ1701347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf17bbda1e58e470be054d0924ba260ff287d57b2b44aff402d69649553edd5b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMRSZ1701348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb9253095dae85e070396c676d4016d7566b9442b12d3377bd1407ab24cc287. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QMRSZ1701349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8bfc1088c00549d946b30aa8f49014ae4519a5ce1624068b7ce179b6d1a9202. Chain 2 (Bitcoin): anchored in block 957681 (2026-07-12T09:09:02Z), 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/QMRSZ1701351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b6fa328edb79482cf6b59ba3228b25909f2af1c2bab01caaf51959d73fb644. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QMRSZ1701352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9712d5a2f85dab01d216465fa460dbae61cbc95e8f3f3e64ad5dff3f1485ca39. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QMRSZ1701353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422717ebb208e1f9b3a77f77f16e8a48b4daa2d588ee1c63d7b1f8e5f9eae898. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZES91839836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c696a9db254a756731f421c6f934aa23a3869118199be264e406f75758cda4. Chain 2 (Bitcoin): anchored in block 957692 (2026-07-12T10:37:51Z), 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/QZFZ31991258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed5dd9167f9a2e7048b6bf63f46c5b78624f4877adc417770d8b97be1cefbdb. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZES62377804.