Volker Kriegel (24 December 1943 – 14 June 2003) was a German jazz guitarist and composer who was a founding member of the United Jazz + Rock Ensemble. He was also an author and a cartoonist. Biogra
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 0xfbe6ac3bf43a5e36c3e15b734fcae50658a7c63a910ac2ebf0cd8208cac0bc9b. 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/582a1c8c-3e43-402f-a8d8-cab8751dd85b.json and https://artists.proofprofile.net/proofs/artist/582a1c8c-3e43-402f-a8d8-cab8751dd85b.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 0x0fb7f0fdfd26a8df039a4589a369e3d85a06d4ca927f621357fc28f1f08fbca5. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:54:31Z), 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/DEMV91805601.
Two Concerts, Pt. 2 (Live, Bochum, 1990)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cedf911d4fd62f1545c9b7d19a8aa441f013d89b614d37a3bdd90c679d69d90. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/DEA117402420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c9d14c49670c8e1970ebcd952c5ac82df1bf70f9c083f15c96630fa0af63e8. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/DEPI81502888.
Volker Kriegel: Mainz Studio Recordings (1963-1969)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157a938e05e8c828360ebe6bc58ef6e1bc6cb77d29c97bb15efe2fde6d4768c1. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/DEDH76772612.
Volker Kriegel: Mainz Studio Recordings (1963-1969) [Extended Version]