Sergeant Steel is a hard rock band from Austria, which was found by guitar player Jack Power, singer Phil Vanderkill and bass player Cosy Coxx in 2007. Sergeant Steel plays traditional hard rock music
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 0x53995b6ba416befe3a116c171b4893e693a45f7856e0c3acabdab10b1153f5bf. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e66425a5-7f66-42fa-918a-d5e36d244383.json and https://artists.proofprofile.net/proofs/artist/e66425a5-7f66-42fa-918a-d5e36d244383.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.