Jan Roth (10 November 1899 – 4 October 1972) was a Czech cinematographer. During World War I he served in the Austro-Hungarian Navy. Roth started his career as a lighting technician at the New German
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 0x4b2c63b61f99fcb8bc4aa53820b408d7e83788c1fb5fe382a97fe1956cf97fb2. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e41ca085-fc52-4445-9a4f-4a6a1f3c93bf.json and https://artists.proofprofile.net/proofs/artist/e41ca085-fc52-4445-9a4f-4a6a1f3c93bf.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 0x7009577c7d1c880207d1929e4513b0e13bc27275bd05a31b0a425723cc215b73. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/DEAH11800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788e656d15113eadd13104088b26c51558efb49f9bfec7a4c8a3cc6cdb12b83d. 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/DEAH11800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649d4c38f8f65b7e9974e29d5bfae24a6317a472921e9780fe5961cee4a6200e. 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/USHM22444255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fbd8d89c7cb6cd583de98dadc44be3d9170804657bd9f43f5aa56ea1368aff. 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/USHM22444256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0eeb66b3de86e9a768444f617c798d2bd80d1223b9399f67f834836dad5a867. 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/USHM22444257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92ed4b5c552cf43e56accde29559ce8640290dc4d887be1a0d622c4739bb666. 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/USHM22444258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c72d9231242f4cd7b412600c4e00f14f2c03ed198cabb37c8177f19d26becd. 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/USHM22444260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49fbbc1a5eb841b10ce51d8ab4257ee5e49beadf3056e232e5227ce23c83912. 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/USHM22444261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc7ba0e88b894e9373df6cd24601a4656edd4638dc3e4539c3e58102e55a731. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USHM22444263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84aa407f466f66841532062da9248d3116aea6b5598322515d2d50125e76670c. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/USHM22444266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d2bd10173c1f1660389b6643c6d7660e9d273a8399770000a46640bc3d8522. 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/USHM22444268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12c812f8823b51d391181b40cd56c81c52a8ad16831e2995cff4f2e5ee5292e. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USHM22444270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa04626df12396c79befad33a81bb0920ad04ed36d60283862b0981b6d0c962. 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/USHM22444271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5942eb49ac2c2698b31facbd962ef87f9361c3d09d48dd0e638790926279b22e. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/USHM22444272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38850787c98e4a5f63d8969c70d9897e3dae883bd3a39163c193157092053128. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USHM22444273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98598b7fc035705e3b0c70967224e81f489e6ead4baba809430026958d7b4897. 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/USHM22444275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510cd91ed2d8d0b69cb257125d5a6c96cb022d3e5c1e8cc4ecbe2fb8facaa14b. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/USHM22444276.