Cohen () is a surname of Jewish, Samaritan and Biblical origins (see: Kohen). It is a common Jewish surname, and is the most common surname in Israel. Origin Bearing the surname often (although not a
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 0xdb2b1ced19235e5928dc885a0ca767d93582f5e9e40b133cbc02e5adac90068b. 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/0e46a6a9-a1bc-49cd-b4bb-27bfb198ff4f.json and https://artists.proofprofile.net/proofs/artist/0e46a6a9-a1bc-49cd-b4bb-27bfb198ff4f.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 0xc895b7bc41f966c780139745375ec985124dd9cc72131640be42e51153169c41. 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/IL7532413080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621a6818527d32770f29233df4fdf6d07964baa850cb3547f69ad31487ef2c97. 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/IL7532413081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78129a51a6a39b83d902b193110c9275b41753ae693e557dcbf84ecfb5d20073. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/IL7532413082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc060e797772a86a3523c75f3d55e436c4a58106ff6a8002d956fa63ab8d831b9. 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/IL7532313247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249bf74eeb7fbc955c96293e7d2f6b111deb7a7a77c6ec8008395328f7ea8f7f. 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/QZTB22215606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc060e797772a86a3523c75f3d55e436c4a58106ff6a8002d956fa63ab8d831b9. 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/IL7532313247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c911491d3515fe64d5d1442e6a2d44b0aa45e827b5a8de4f19d55a3e422d11. 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/IL5842340907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa2f5b81ff29cdacdc9b421c84074443b9334b86e97407aa9595af0c3028b5d. 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/IL1042206591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4838f07d6a2d0f5fcfe28f4c1fd06aa2277b85c7d17d4fdd34d60331a60157ef. 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/IL1042206592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8194f95c61a189f421aaa8b6869d32d6c4ae2962500e671cf9812f3a2ed353. 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/IL1042206593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305490ce850cbd90b1b300469396a3c2c2196805cc567725d0787db14b32f632. 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/IL7532212673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc6e0d11891f723f77a6103ab0ed44ccbe77add08a75d6ccde2360fa53e20e0. 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/IL7532413525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff60a02be4d472af7411e331809b3c9be6d15652b1816aadaab2df9ce3e6c13. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/IL7532413526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1435f0751f00a8c808c8ef6fd5f1e2e31061ac42cb65de3e0136ad830f4a11d. 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/IL7532413275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59592dd12dd633727227061c321603e8a0f843a74ced0f205681c5d2afca39d. 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/IL7532413276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657ba965809498ab27d897643f70dcb2007204251aa845f51fe4ddcecadb63dc. 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/IL7532413124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0180d531ecfb6c10e718e9ce4a8dc699541eac3c25d89b5ea5a781177c49cd2. 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/IL7532413277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3224b25ab97befdf6ef4405d6ee3edde8bd511718fd67c61502e1bc8b77130c. 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/IL7532413278.