Achtung may refer to: Achtung, a German word meaning "attention" Achtung! – Auto-Diebe!, a crime film from 1930 Achtung Baby, a 1991 album by U2 Achtung Bono, a 2005 album by Half Man Half Biscui
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 0xecfcb3d199123b50ecc98dead72e327d98dc9982254fbbd26f3f86a299fe9db4. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9282e98-8907-4124-a77d-6bd7d2d269f3.json and https://artists.proofprofile.net/proofs/artist/a9282e98-8907-4124-a77d-6bd7d2d269f3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
마녀의 성 (Original Television Soundtrack), Pt. 13
다시 시작해 (Original Television Soundtrack), Pt. 2
The First Night 〈Sanullim's 50th Anniversary Collaboration Album〉