Kontroll is a 2003 Hungarian comedy–thriller film. Shown internationally, mainly in art house theatres, the film is set on a fictionalized version of the Budapest Metro system. "Kontroll" in Hungaria
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5364222518d6a4ddb59a82cbefc1d9180c4c13c6cbfc7888099df574d3c4db65. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cbd1da80-3291-4774-a146-5a18c8aacfff.json and https://artists.proofprofile.net/proofs/artist/cbd1da80-3291-4774-a146-5a18c8aacfff.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5147aab270942c8492a3edee68d342bb63e921c87b8aaf738497252037d3b3e. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HUA612502709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aebc4e58da3875d62aa9cc87b0edaffe5f5122e8a53565676591f1c63c9409f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HUA612502710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de35d7aa0aadfed82feb9cd9db8fed5ef859558983d45d94115376188fa826d. 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/HUA612502714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1cbf2c0461823fcfb1d2d4d17c31966967a320ee0cb307bf4448553d927e5f1. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T16:28:26Z), 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/HUA612502722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26629477a3757439e9ff23d032aa95cc9bb795206209b9f69889eedf5440669. 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/HUA612401761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40bcb298af0688c3be353eaa4faf27f1905cf4a4b1b16eb74e8e80f6773a4ed. 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/HUA612301600.