The Serfs (German: Die Leibeigenen) is a 1928 German silent drama film directed by Richard Eichberg and starring Heinrich George, Mona Maris and Maria Reisenhofer. It was shot at the Babelsberg Studio
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 0x91960d1488f3a901a42d5c8016d8fa9ec8cfacdf3b04dee89da84e4116b900a4. 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/03a55ae7-4357-4421-bfbe-557622b9a11b.json and https://artists.proofprofile.net/proofs/artist/03a55ae7-4357-4421-bfbe-557622b9a11b.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 0x5b64fdf9564896a3d9654005ed216c7f0e6133987427880c4cedd126d9d606c7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6M1926967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88729490b8d1caa872341d18f91d44438b5cf60dd3382c97c46d7ea7320f743. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6M1926968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32eb5c544cb2068e9ce71c16d0fc0f025f5fafaf630ffdf998db73412e64f3e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6M1926969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5623753913558a72206413ca956c9fc05cea4eac4fbb5af554713595efa1fe. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6M1926970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1f05e7f781ac82adff3c404df2a1aa771b1631944a24f97bab643d7d24bdc5. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZK6M1926972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10d3a53ef7e4f5017f00041553028d89cb67b0f8abfca83ee661b5037f2e3e3. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZK6M1926976.
Angelic Ritualistic Cruelty b/w Debt World
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8afb5adddc9e619de07611610e6c09d4da1fd698e82a856da92fd397f7920a5e. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/USA2Z2101404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3fa0d7e5dfe826a3bbf19fc35ced436f6264a8f1e9459600157030efd7bba5. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/USA2Z2101405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563e8e8d7e3f2238f5481af5a1f177161495d264eac7f5f65283a66f082feb52. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QMXQJ2318401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb698aca05da27e6caad3f93d45f44cf42f86c2eca22a854fdc7e0aa0b9af0744. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QMXQJ2318406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824176495a9f2078640a00e5e1ce48352624493ebd4269ad206ccda4db2b0e4a. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/QMXQJ1419601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89f91709cf6aa3be7bcbf695741b3022e7dec542620ca1f4231e99be6af538d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QMXQJ1419602.