Quarterhead is a songwriting and production duo from Germany, formed by Josh Tapen and Janik Riegert in 2010. Career The duo's international breakthrough happened in 2020 with the electronic dance
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 0x554930327be65e113fca36c979782c3aa6083e34dc08c98b2d550763af0263c4. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e809406-1f44-4680-b8a3-aca07aaf0782.json and https://artists.proofprofile.net/proofs/artist/0e809406-1f44-4680-b8a3-aca07aaf0782.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).