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![TFTC21 Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::915954364774326273.png) TFTC [@TFTC21](/creator/twitter/TFTC21) on x 80.3K followers
Created: 2025-07-17 15:20:00 UTC

Ken Shirriff just mined #Bitcoin by hand, pencil and paper.

One SHA-256 round took XX minutes.

![](https://pbs.twimg.com/amplify_video_thumb/1945201737284878336/img/oJilMCraVH1v8HZZ.jpg)

XXXXX engagements

![Engagements Line Chart](https://lunarcrush.com/gi/w:600/p:tweet::1945866079244607733/c:line.svg)

**Related Topics**
[#bitcoin](/topic/#bitcoin)
[bitcoin](/topic/bitcoin)
[coins layer 1](/topic/coins-layer-1)
[coins bitcoin ecosystem](/topic/coins-bitcoin-ecosystem)
[coins pow](/topic/coins-pow)

[Post Link](https://x.com/TFTC21/status/1945866079244607733)