Gottfried Huppertz (11 March 1887 – 7 February 1937) was a German composer who is perhaps most known for his scores to German expressionist silent films such as the science fiction epic Metropolis (19
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 0x32cc8d6c7ebd9cb1fe69f0d55150ac7542b26bd2f4682abd82f96d85dc0d92f7. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/319bc9a2-a473-4f09-96c5-c25907dcba74.json and https://artists.proofprofile.net/proofs/artist/319bc9a2-a473-4f09-96c5-c25907dcba74.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 0xf4c2dbf6242faaf1d2ca2509bc31bc5ddfbc4547da13692f1669a63a559ece6d. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/DEB261100272.
Metropolis: I. Auftakt: Die Ewigen Garten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa564eba9a3f0ead1343554faedb011f3b931c08b4a11e3a8103feb1f2d90484f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:34:45Z), 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/DEB261100274.
Metropolis: I. Auftakt: Maria mit Kindern
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0793edd2be312120b52604e0b2d1a1e7b69b5fde88be1eabd2c9e20e42b5fa0. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/DEB261100275.
Metropolis: I. Auftakt: Im Hause Rotwangs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec68be9de5e0fe3d6ed28d279649322949c907091714a53836d81c3d533de059. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T03:59:13Z), 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/DEB261100279.
Metropolis: I. Auftakt: In den Katakomben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a5d7a33e7cfeea6ea8cd3ff6c2bb1943f746fd1ac65eccc0d86cc9e3964fa4. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/DEB261100282.
Metropolis: I. Auftakt: Der Turmbau von Babel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d9391f057e3dc04252f2f4c3822a6dad138df28162e8d243147b31a1b12e40. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/DEB261100283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43588f0ea23f94ad6d4c2111743b36670587151c84cdc13f0cfd51cfbd2efdd. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/DEB261100292.
Die Nibelungen: Siegfried & Kriemhild's Revenge (Original Score)
Zur Chronik von Grieshuus (Original Score)
Metropolis (Original Motion Picture Score)