Jan & Kjeld were a musical duo from Denmark, consisting of brothers Jan and Kjeld Wennick, both singers and banjo players. The duo, active in the late 1950s and early 1960s, was especially successful
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbbbe7ebc84f72d6b70eecf6128796247b0f65527b28fab1686089f88ed9562. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5c979f5-e976-40ea-a8da-c1b4b11da40c.json and https://artists.proofprofile.net/proofs/artist/a5c979f5-e976-40ea-a8da-c1b4b11da40c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2204c79f3b9297bcad06af1d6de6cb2d336705fc65a3ed44e0f775e6535b9d1. 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/GBSUW0702892.
A Tisket a Tasket / Sweet Sue (feat. Gert Wilden et son orchestre) [Mono Version]
Banjo Boy (feat. Gert Wilden and His Orchestra) [Mono Version]
Banjo Boy / Mach doch nicht immer soviel Wind (feat. Gert Wilden et son orchestre) [Mono Version]
Tingelingeling dit son banjo / Mélodie d'un sous (feat. Gert Wilden et son orchestre) [Mono version]
Les banjo boys (feat. Gert Wilden et son orchestre) [Mono version]
When the Saints Go Marching In / Tiger Rag (feat. Bob Langnoff et son orchestre) [Mono Version]
Zwei kleine italiener (feat. Gert Wilden Et Son Orchestre) [Mono Version]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0982d68433b94bdbd8bbd59f7248bb18a627472745756bd676200b88d6bfa058. 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/DEF705900105.
Masterpieces presents Jan & Kjeld: Hits & Raritäten
Masterpieces presents Jan & Kjeld: 10 Greatest Hits
Masterpieces presents Jan & Kjeld: 5 Greatest Hits
Masterpieces presents Jan & Kjeld: Banjo Boy / Tingelingeling, mein Banjo singt / Träumen kann man was man will (3 greatest hits)
Don't Raise a Storm (Mach Dich Nicht Immer Soviel Wind)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2204c79f3b9297bcad06af1d6de6cb2d336705fc65a3ed44e0f775e6535b9d1. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/GBSUW0702892.
100 Deutsche Schlager Hits der 50er und 60er Jahre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9d3f3f486a536864b8b0a726acc95d0e6620f5f29c925150c6a4d004239627. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-21T17:00:19Z), 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/DEF161484401.