Cosmo Klein (born Marcus Klein on 1 November 1978) is a German singer and songwriter. Biography Cosmo Klein was born in Lippstadt, Germany. At the age of ten, he and his parents moved to Texas, whe
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 0xfa38391776224705db757d0604aa2e746da151f2cc646bd79f43750e31b125bd. 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/afce7fa8-2c15-4c92-8f01-61591a564e46.json and https://artists.proofprofile.net/proofs/artist/afce7fa8-2c15-4c92-8f01-61591a564e46.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Diggin for Gold E.P. (Incl. Remixes By Wild Culture, Mynga, Dry & Bolinger, Dantz)
Philosophy of Love (Mobile Home Sessions Berlin)
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 0xcb53f62471205b85bc7cda394c2e3a5c9c7c9ff212ce77b5c8408c70447c2f62. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QM6N22414460.
I Do Love You (Oliver Frost Reggae Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb53f62471205b85bc7cda394c2e3a5c9c7c9ff212ce77b5c8408c70447c2f62. 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/QM6N22414460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5242b4f31567d9fc684f92e855313c11071a68b283f304a4863d97556c2b78a8. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM6N22414507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b37d15c8f30aeacc392c6167662e9284754bf82bd3a771c50155c9f42f8a008. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QM6P42580043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828988a39221befcb86c170d27a0e82a3f4db26dbefebddfd3936c8d2abc72e7. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QMFME2515298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0113e2965da5f1dd2acc02b85d719097f1176041eee5b207289cdd625b48a98f. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DEUD91899840.
Sinner For Life (Mattei & Omich, Per QX Remixes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7807512ccfbc1f9f3269a1715039c57e74dbacdbbb5492d8f6856cca5bef213. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CA7C62301079.
Sinner For Life - Mattei & Omich Dub Edit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107066b51de12b2d665976e044ca4abf476c52a9de1d15d25b17cc0209773121. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/CA7C62301081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c09619be28a968eac02729fa8fc7293f8feb3af30d99305b2b87ed2bfa3a9df. 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/CA7C62301082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391c2e209fcf789a50b7bf07771019da0839a54a716ed168b2dc5304bd8d5a55. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA7C62200880.
Back Home (feat. Cosmo Klein) - Kayliox Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67468bfbe913dd88db7f0f963f0e2366e144ddb266c4840e388416730394f15f. 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/DETH81400003.
Back Home (feat. Cosmo Klein) - Bender Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fac4947920cb2b660dbc6dc5fdf79c30573a9c80e0aade7fba9153b674dc5b4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DETH81400024.
Back Home (feat. Cosmo Klein) - Matoma Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4307d5903b01d08db89e6167e3b7f1eb3365597a1584466fa51e858d6b756727. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/DETH81400022.
Back Home (feat. Cosmo Klein) - Unplugged Live Session
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784187d77aa8f054f4cbda21b232fc1ff70a9d0499295be8af8dfc8b8890e3ac. 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/DETH81400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784187d77aa8f054f4cbda21b232fc1ff70a9d0499295be8af8dfc8b8890e3ac. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/DETH81400019.