---
title: "On-chain timestamps"
date: 2026-09-25
category: essay
lang: en
summary: "Every version of a post here can be timestamped on Ethereum. This one was, from vincentc.eth."
---

Every version of a post on this site can be timestamped on Ethereum: its SHA-256 goes on chain in a transaction from vincentc.eth, and the file is published unchanged, so anyone can check that these exact words existed by the time of that block.

This post is the first. Its versions page has the transaction and the source.