Axel Zwingenberger (; born 7 May 1955) is a German blues and boogie-woogie pianist and songwriter. Biography Zwingenberger was born in Hamburg, West Germany, and enjoyed 11 years of classical piano t
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 0x9c7cc969ab09ba32da4bdf4e926c93242ea89a68acaf7d9a33853e85062d756e. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a741e93a-34d3-4f1b-968c-da38fe0fd48b.json and https://artists.proofprofile.net/proofs/artist/a741e93a-34d3-4f1b-968c-da38fe0fd48b.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 0x67ed7947eb3d4514543b54faeeb439f3ac0e17643b3a543b52a7f71fcf0603bf. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/DEF069112540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37101396424ac1f9fb32da0f6331ded6a3ac8d163d9df4bf664c39c4b86ff39c. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/DEF069112570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52f9a8a866bd922ec2a40082b683dfc517d1e9e7728e01cfbe3fde93c6b2f28. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/DEF069112590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3659a4b6b8a5d865d758a6109f65b60197fe94dc74c2f29c9b3dde7b38872832. Chain 2 (Bitcoin): anchored in block 957714 (2026-07-12T14:35:57Z), 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/DEF069112600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2003d57f4910ba26286ce4ea518329954677e7f8c84056294aa963dd4621efb. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DEF069112620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278bcf5e933c6465185464e95a4c09c4bcca3a6f7d3799befb277c41bff7a902. 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/ATF069100090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278bcf5e933c6465185464e95a4c09c4bcca3a6f7d3799befb277c41bff7a902. 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/ATF069100090.