27 may rexfer to: 27 (number), the natural number following 26 and preceding 28 One of the years 27 BC, AD 27, 1927, 2027 Music Artists 27 (band), an American rock band from Boston, Massachusetts
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 0xada4bbe6f83bf47176153e3ef7cedb7f540b958d76dfc5b9526d90f6848d26fa. Chain 2 (Bitcoin): anchored in block 953958 (2026-06-16T14:52:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2703e70a-ece6-4d4f-ad42-24d568b91687.json and https://artists.proofprofile.net/proofs/artist/2703e70a-ece6-4d4f-ad42-24d568b91687.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).