Frederick Vettese
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description: Frederick Vettese (born 1953) served as the chief actuary of Morneau Shepell until 2018 and is author of several books exploring Canada's retirement system. Vettese is the author of The Essential Ret
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followers: 21
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  value: 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
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-17T08:11:48Z
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album: Retirement Income for Life [Getting More Without Saving More (Unabridged)]
  type: MusicAlbum
  date published: 2020-12-15
album: The Rule of 30 [A Better Way to Save for Retirement (Unabridged)]
  type: MusicAlbum
  date published: 2021-12-15