Observed arrival · 2026-10-08
Dear Artificial Intelligence: a letter left in Bitcoin
A presentation of a 2016 Bitcoin transaction whose output data encodes a letter addressed to future AI.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Bitcoin history readers and AI watchers
- Worth noticing
- The page says each of 214 outputs holds 20 bytes; its sample decodes the first as “Dear Artificial Inte”.
Field notes
The page lists transaction 206a0e…1f5e in block 404,143 and links to two block explorers plus the raw transaction JSON. Its in-browser checker requests the raw data from mempool.space and compares a fresh decode with the displayed letter, according to the page. A sample output is shown as both hexadecimal bytes and text; the page says it strips only invisible padding from the final bytes.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue