Karl Wolf Biermann (; born 15 November 1936) is a German singer-songwriter, poet, and former East German dissident. He is perhaps best known for the 1968 song "Ermutigung" and his expatriation from Ea
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 0xf43ca463704245b90265375c936b2fe6da44dfd5117e446e081d20f0357eacee. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cb95ffc-8953-4322-b36a-7080b8376d55.json and https://artists.proofprofile.net/proofs/artist/7cb95ffc-8953-4322-b36a-7080b8376d55.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 0xc2933bbee9043718ebe305d6db01f58a7c718044ce0c4cc5c018c54adf3d66a3. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/DENE26800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3897149441b85336ec707561fb5edda920c680913c3c7bb09354c854fde0f70. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/DENE27200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf1eb2c1faee978c272a4d976a71af8e54ba517dce56422ade36d68114ffcaa. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/DENE27300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68da6f1bfbdb2d23bd69f3a9d3208cac3c752ac168a017474b72e7b111d70090. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DENE27300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077c32736088499ce70e01def226e35f29708522d19198f6215e38a40a292458. 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/DENE27600011.
Das geht sein' sozialistischen Gang (Dokumentation Köln, 13. November 1976)
Der Friedensclown (Lieder für Menschenkinder)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf1f48590be82d7572582ad476a84383263f541599ddc4f33c2661e1babc4cf. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/DENE27700023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95686e849a57757078091e698314eba37d80be781dcd306fa1ba9eff03e6aa51. 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/DENE27800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95686e849a57757078091e698314eba37d80be781dcd306fa1ba9eff03e6aa51. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DENE27800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4910ef043528477a813f329b2cb717026d3e9a3ee44b80993d98f04b24fe16. 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/DENE27800007.
Eins in die Fresse, mein Herzblatt (Live)
Im Hamburger Federbett (oder: Der Schlaf der Vernunft bringt Ungeheuer hervor)
VEBiermann (kennt keiner: uralte Lieder vom jungen Wolf)
Nur wer sich ändert (alter Biermann - neue Lieder)
Brecht, deine Nachgeborenen (Live Akademie der Künste - Berlin am 20. März '98)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd0bf0a24df80ac3e69a3b6e43a1f111ecd686ae1685ce04138cae00f02bd2a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DENE31629030.
Paradies uff Erden (Ein Berliner Bilderbogen)
Ermutigung im Steinbruch der Zeit (Live-Mitschnitt des Konzertes im Berliner Ensemble am 16.November 2001)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893309fbf39ad7778ad1e8c42eea6b87c847935d5295f329cdaf8c32d861a449. 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/DENE20100005.
Ermutigung im Steinbruch der Zeit (Live-Mitschnitt des Konzertes im Berliner Ensemble am 16. November 2001)
Großer Gesang des Jizchak Katzenelson vom ausgerotteten Jüdischen Volk (Live)
Das ist die feinste Liebeskunst (Shakespeare-Sonette - Ein Liederzyklus)
In diesem Lande leben wir (Sololieder - Chorwerke)
In diesem Lande leben wir... (Sololieder - Chorwerke)
Warte nicht auf bessre Zeiten! (Die Autobiographie)
Barbara (Liebesnovellen und andere Raubtiergeschichten)
Wolf Biermann RE:IMAGINED - Lieder für jetzt!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e6a698e398da8674d817db93ff711790a0832265bbfe0fed5684c1804ed9d9. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/DENE28800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaeb19535fc5a079b181ce60eebda6ce23d59c92c9e89cc62d6b03828508773f. 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/DENE27200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c37ee63103f2f086d689d3d45e3f7f4a42224742bdcace8d854be80ffbf549. 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/DENE29900052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15943fed41e5ea0c4661e6ee3674777bc7cd13b2fda34d8e8d8f2c2b7b87ab8. 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/DENE27700025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f33edca5913cc61cfe8b186f8987ddbf82384f79ddaa4c5230c1fbe3be917e. 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/DENE27200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e430fff4fc91b1b4084a035a8c26b2955de095a4158c7c0ad51b49e9f279c8. 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/DENE28000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1c4072962dff485ee8bd84b472cfd98595c5ce04cf1e1afe82a77438b4ea82. 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/DENE27300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1c563b3d8c444eebe376ca1e08b0804bb7439dd03ae419d7ac3ad6e2d5ee68. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/DENE28500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9360ed97edcc20796612a9668467c673ee52fe419c1a5f8c5f181c75dfa3b2. 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/DENE26800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44b8f0774ed53b9b19edaffb7393bf9495bf530a128eb82e93773933bce74e7. 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/DENE27500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5503513f27ead7a007e6f3fe18ca92048c42c4c854fe4d69fe1bccda3c1de86. 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/DENE28500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3d08a4176b92759d2251e63a0de5d1273d72e2ba44c45db78eb3f12c67931c. 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/DENE28000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bdced4b410b42b75335f625ee812dd29760601b097a43c76d9a5f0d66665fa6. 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/DENE27200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd0bf0a24df80ac3e69a3b6e43a1f111ecd686ae1685ce04138cae00f02bd2a. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DENE31629030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafbb11281e5fde73f31e095305c984ee6dd8bcc34d3aa3aa2388d7f6f133b4dc. 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/DENE27300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267f3aaa146daf4b7d7a7c313e55d53eb4e583ac79a5f3632ef82dca0cb72420. 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/DENE27700043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacacc6b0486dc986223ea103bea34952ff0e14b6ba23937055603ee1a642a672. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DENE27200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe9e8259ea67931fe49ba0121daf8d60ec3b91d4fb7024597c9c74ee0f20b2d. 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/DENE28200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c4d62dd68c75c24e0e05c63918ed0b3300f515130431b684113b6b72f530ae. 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/DENE26800011.