is the debut single by Austrian electronic music duo Klangkarussell. The song was written and produced by Tobias Rieser and Adrian Held. It was originally published through the duo's SoundCloud on 29
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 0x8f3f05801fd5317d40677bdabac1eb171456c81b723611c73e5354bc8c121f97. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0e8111f-2bd6-4339-a945-fb92bc4c8fe6.json and https://artists.proofprofile.net/proofs/artist/b0e8111f-2bd6-4339-a945-fb92bc4c8fe6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).