Sheila Armstrong may refer to: Sheila Armstrong (singer) (born 1942), English soprano Sheila Armstrong (fencer) (1949–2010), American fencer Sheila Armstrong (tennis) (1939–1979), British tennis pl
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 0x0cd8017b70ba2b15ccfe8cf1d658658f98ca7bded11676de2e241de96f175934. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6038b4f2-27b9-4270-805e-0ddb2ebf88ab.json and https://artists.proofprofile.net/proofs/artist/6038b4f2-27b9-4270-805e-0ddb2ebf88ab.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).