thumb|right|260px|Hilmar Jensson (2018) in Aarhus, Denmark Hilmar Jensson (born 1966) is an Icelandic guitarist. Biography Hilmar picked up the guitar at a young age. He studied at the FIH music s
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 0x431535bbb6d4c243f0b5c9e8c51f42856863c50df40276194599e566ffc9698c. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/faafbf9b-04f7-449d-94c2-f399006f010f.json and https://artists.proofprofile.net/proofs/artist/faafbf9b-04f7-449d-94c2-f399006f010f.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 0x41861891b3e6d32a5135a485028aa4af23640682f6f526551048269c3cdfc325. 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/ISV441618801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232e4e03a5823295f3de40d2996533c995c2a2c475a7f9bd4866dd2330b9acd4. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ISV441618802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5cb43f6b3214c4f46255d2c545984038ea5395c86a95176e493e5877b4128ce. 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/ISV441618803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1956dca22d32f0a1919893857a2ed4e6446c62d77e12c029437118e7f545189. 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/ISV441618804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c5481890294de22bb542e41354ec70c1c21018f1dd1c6e0f2871dcac227cffe. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/ISV441618805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54acb8905f32d6546225580fdecf42bcd6f16852d2e0e9a7258c6d1eafa93bea. 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/ISV441618807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f7b4ccecb61e312e208fc903766749fee9b97dd0d5bd439926793aeb35f9d9. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ISV441618808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a16007714caedc848021b17797db0dbf530638e936d52b84e26d74f9dbcdf8. 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/FR96X1701375.
Kitchen Motors Family Album: Fjölskyldualbúm Tilraunaeldhússins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227c1b164a7cd92b7df16f571790faa69d24742db433ba3eae450e8f77099d00. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ISU110600210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee97346684a9e47fabed910c4be44eefc10bdb2048fafbc3f4d9874e5d9f25b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DK6B62300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd79dd624284d4a0849988285b53953eb339cfd95617c70ce45e740ec15cb69. 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/DK6B62300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eaddaf78815aeb1484d198b27afbdeebdfccbd8e001f7c49611be58215c7c4e. 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/DK6B62300105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8466ac43c99a6b7df561ee69412a8e6a632c0bdb2002dc23b66c0cf514cf3b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DK6B62300106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f437268b7e68dc3846770da21a249d8ea3869f99dbc268e79bfd6a0b199f8e0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DK6B62300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c413a9f9cbddcadc0d463d9722a32f51687ad348fb89b60a14bab04f8e1652. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DK6B62300101.