DU or variants may refer to: Colleges U.S. Denison University, in Granville, Ohio Drake University in Des Moines, Iowa Drexel University, in Philadelphia, Pennsylvania Duke University, in Durham,
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 0xf310237408456168982a5300573ebf67acd783b7f6365018ace507b2990e2300. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c63a1af2-621d-44e8-a411-3d2bb681b49e.json and https://artists.proofprofile.net/proofs/artist/c63a1af2-621d-44e8-a411-3d2bb681b49e.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 0xa364ebde899a13c45f677a6e10668ab30e1bf5c0cf5e45bf8562d03544cd1d3d. 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/BRMPU0300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cabf99e746f09454fa6bca1a0161438fcec7ebcc24c1dc01236bec6ef3837ad. 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/BRMPU0300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6f4e19e4bacc3b7356f09d336c399ad16b25cac036e257d99d90b2ccdefa8d. 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/BRMPU0300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42020f01c99cb36cb04f1964dd2a0b4588dd972fb499a3c26e9937664172ebc4. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/BRMPU0300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba13ec8ada50cc075373cf224d33b931844521919ea60d7aa9b52cb93261cf0. 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/BRMPU0300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76b9906987495a36614cf4d9555908e9f4f1192401100f1d742adf41d6d3f2f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BRMPU0300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc06be186038bb71748c9cad754ddca01f068ff62e3f2230960f17f7382aac1. 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/BRMPU0300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576c6d73937f030e88150bf20b20c721fe6bddca22941b4a17da1c256e011d50. 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/BRMPU0300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2995c8a4bf359bd365173c3eab7ca055f7217bc815fe1ad92b3c780fa3c874. 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/BRMPU0300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8140571f1de69153b1eb4617cdef4aa92f73a3d97227ba92cc970c4541cc4871. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/BRMPU0300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68362f29a75367245d5137994ff3352bddecca5a91b63b3f357e6ae71dcd701f. 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/BRMPU0300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf105a9bb7ba68dddb061278d1742cd431c042ae8b7c64631883a12badb6f7c7. 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/BRMPU0300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1185e98f68b62109fc5cf95c8d8399c3642b3ea99c45868460292184e834cb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BRMPU0300031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8917fd0d81ace7e235005f10f7ff9331a442d802a67653b39c2b7d1e8ad2ebd1. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BRMPU0300032.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385786a262db2940f93b18ddb8e7afeaeefc3003f55e26ce24a08cbc979dfb42. 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/QZES91872694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47faf4ed4583276009275f0693ca0d5074056232c9b0c6073a6dcaabd69651c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZFYZ1997783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8df4772e764b7999c191d4ccc5fd3daf0431d35163b199313399c5999898fbd. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZFYZ1997788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92320101ece526c926b34095f9c9c11049ff1219b8ff2659822e9dccc81a4df0. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZFYZ1997792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba0f499b5dc5af98990d1bedc61ba23ab2d8b86a6d647677ab3656d3a1a8a19. 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/FR6V80818098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e8b41df971ecd5f8ab0795a2a544a942e2d0fddae20738ab7e0474cf4b2e74. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/TCAHJ2326474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94d91f6c72c3a9cd9d0edbd159e87ebfb81040f8f74bc567c687839e98d1880. 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/QMPKX1877235.
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