Eugen Berthold Friedrich Brecht (10 February 1898 – 14 August 1956), known as Bertolt Brecht and Bert Brecht, was a German theatre practitioner, playwright, and poet. Coming of age during the Weimar R
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 0xcea11dbd8f8312eb3081420abbf234b6c8c7fb8598d36fd0ec685d96ca39bc21. 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/d62b25da-3bab-4d32-b09f-6bbb34d20211.json and https://artists.proofprofile.net/proofs/artist/d62b25da-3bab-4d32-b09f-6bbb34d20211.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Weill: Die Sieben Todsunden / Mahagonny Songspiel
Bertolt Brecht - Balladen, Lieder & Songs
The Ballad Of Mack The Knife - From "The Threepenny Opera"
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 0x8434bcc2c6a87db3330e02d91561c18dce897819932250dd259cc5def9bb39bb. 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/USF095400030.
Ballad Of Dependency - The Threepenny Opera/1954 Original Broadway Cast/Remastered
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d03662de0f8f9e177288b16c6f9d3d2a2ebb74c62d387c1e8e98b21a133979d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USF095400100.
The Threepenny Opera (1954 Original Broadway Cast)
Bertolt Brecht before the Committee on Un-American Activities: An Historical Encounter, Presented by Eric Bentley
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013a899e222ced87a9a2226062216e51e6f9047274fcb705de33b38c1fdd9c68. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEU240774553.
Die Dreigroschenoper: Ballade Vom Angenehmen Leben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070cccdd4330525607208d8fda49792f8b9ace48824722e81afac34c52a91424. 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/DEU240774554.
Die Dreigroschenoper (The Threepenny Opera): Prelude: Moritat von Mackie Messer (Ballad of Mack the Knife): Und der Haifisch, der hat Zahne (Ballad Singer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2353caaa00df4aeb63d29ad9d23b8305235d30bbb0d12dc6a543baaf55c67002. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USB8U1010780.
Leben des Galilei [Dramen. Erläutert. (Ungekürzt)]
Die Dreigroschenoper/The Three Penny Opera
Die Moritat von Mackie Messer (1.Akt) (Zuerst höre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733b54403b4616a74eae6f8fc5f8cd5c7506b1c95c1b346207bd80b5a2cd2365. 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/DEA311402427.
Kanonensong (1.Akt) (In der Erinnerung an ihre gem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597d84184bd2610d1469de0a75b3a91a126b2d5d06c88b829e4ea028e4eba457. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEA311402429.
"Ich komme gleich nach Goethe." Ein Abend über Brecht [lit.COLOGNE live (ungekürzt)]
"Ich denke, dass ich mir sicher bin" [Bertolt Brecht vor dem Ausschuss für unamerikanische Umtriebe (Gekürzt)]
Classical Slumber Time For Children, Vol. 20
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78669d9d66f4bc1f66cbbab235276efa81b44bcf435d2597f5a81a08a2113926. 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/USSM16700281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8352a20d4acb840ba24fb5ddc8c9ae6eef1faed16c624c246062b0d34e594fd. 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/QM6P42211822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb371b4ff6eb7455b17368ba4e81660a65638e110f2118eca3257548a02bee8ec. 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/QMBZ91335423.
Die Dreigroschenoper (the Threepenny Opera): Die Moritat von Mackie Messer [the Ballad of Mack the Knife]
Weill: Mack The Knife - Songs of Kurt Weill (1929-1956)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f0c04e737f611275fced390ae4acf0cc9b362ad5ce449a9bbdfb7689116ae6. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/HKI190719801.