James Johnstone may refer to: James Johnstone, 1st Earl of Hartfell (1602–1653), Scottish peer and royalist James Johnstone, 2nd Marquess of Annandale (c. 1687–1730), Scottish peer Sir James Johnston
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 0xfa65cba830cf2eb35c50081f9dd0e46e1e2e807a7f2043382299548e05fa5e58. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6432755f-7933-43ef-995f-206f949309fd.json and https://artists.proofprofile.net/proofs/artist/6432755f-7933-43ef-995f-206f949309fd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Couperin: Complete Works for Harpsichord, Vol. 7 – 15th, 16th & 17th Ordres