Guy Davidov (Hebrew: גיא דוידוב; born 1970) is a professor at BI Norwegian Business School, Department of Law and Governance,https://www.bi.no/en/about-bi/employees/department-of-law2/guy-davidov/ and
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 0x03bd2acb6d3cee31eb6fa24cb5c9b3b88e23caab7f6e028e97165a2f145a4705. 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/3e53cd45-7c40-44d6-afae-e6a4a0744114.json and https://artists.proofprofile.net/proofs/artist/3e53cd45-7c40-44d6-afae-e6a4a0744114.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 0xb6bde0106c87716d31dc81be45382875c639c25ca7fd57e47e279a8ffd0ac7b0. 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/IL1042206101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdf7066076ff4db89f75c1844c15f3a877a18cc667d5a4c4fca33ce5883d974. 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/IL1042206102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb68cebe41f163f785aedcbcc5a61dc548dd412e0e3f62be4fa751d296834ecd. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/IL1042201731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884fc0de46e4b4701335f9a51aeefb0392fe362d14de5739487beebcbbe0e5a0. 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/IL1042206103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5326a3335ba4349e2d519dd5226ae8ffc869315256f13ee070ebbc88a496381f. 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/IL1042202941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe604fa6d752059e0a48e9b5caa2f1a24aef1c1e342e62a8361294cd699ba7ac5. 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/IL1042206104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fd719c0fce7ef69e06a437d8528eee523be9145c93f7727236135864d10590. 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/IL1042206105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dac5bc20d522ceb8a563193b73c92cbe8b341f30e361195c2f5fbe943a68eab. 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/IL1042206106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc9668161a755149f772079a2b961c09f2829fefd49b1b2d5056a3dcb39d5c44. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/TCAIK2417443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe910fea081e245fe68b2d677894a4c13dabaef57dc00485f7bffd80c1875311d. 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/IL1012400932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf097c78eac7b68d5701907a78120395ab87a2c6c748d3d6646541909a0f9ff35. 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/IL1012400431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6ef920a53e33a165463f5a193497e4276f9ab7ba89fa7a83b3ce3c800e5a66. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAHY2421457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97df5c5da86614b2a263260a5facc1b705226e3977bb502f007d490a87e7997. 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/IL1042400291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6a293fb7fb77e804a3a03cbc1c854b0ba227fca00de8a769aadd53a66ed7f7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/IL1042305891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42faf525bb0eb6ba4658e33d8eaf1d7e1d5a6e21a730d50624023ec8bc85f1d. 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/IL1042303711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5326a3335ba4349e2d519dd5226ae8ffc869315256f13ee070ebbc88a496381f. 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/IL1042202941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86798eb459b4d5ec6e4878c39079ef1e22b7ae0b54ca3bac64a9ea8eed81b2e7. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/US83Z2204774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527a006cdd81a43545756aac4943fd88787098fc7573c11038a0ed4120683aa9. 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/US83Z2204775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12bc49bd0be270da9ceae7a4cc96b23c525c715f3f276904dfb6f8124c7920d. 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/US83Z2204777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb68cebe41f163f785aedcbcc5a61dc548dd412e0e3f62be4fa751d296834ecd. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/IL1042201731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05fab3dd1071a0e2b43b380edaddde8e881aea899332cac9e5c6bcddd081f69. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/IL1312102964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa4e42f64ce867ed7b3a56dc1e71c2862c96a93b9bba1ca9ebf8e37b613f816. 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/IL1312102963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e93007f803de6e606c481087db5aa9ff345f8f29cee6be90249bbe5c17d3586. 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/IL4612100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed835099df8c1bcd96c0042e2ddfdb491c825ac12f43279d65b67fd9ead090c9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/IL4612100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaead0bfd67635af4286290729fded6bb7b0eec960a09305e68601840f261e31a. 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/NLHR22000690.