---
title: "RetiredCoder"
description: "Solved four keys of the Bitcoin puzzle transaction, then posted seven mini-puzzles on Bitcointalk, four of them paying the Bitcoin Cash left on those addresses."
canonical_url: "https://puzzles.agntn.dev/authors/retired-coder"
---
# RetiredCoder

> Solved four keys of the Bitcoin puzzle transaction, then posted seven mini-puzzles on Bitcointalk, four of them paying the Bitcoin Cash left on those addresses.

<author-facts author="retired-coder">



</author-facts>

## Who this is

The same RetiredCoder as on the [solver page](https://puzzles.agntn.dev/solvers/retired-coder): RCKangaroo, four [puzzle transaction](https://puzzles.agntn.dev/collections/bits) keys, then a public retirement. This page is the other side. Keys like 120, 125 and 130 open more than the BTC. Their addresses were funded before the 2017 fork, so a copy of the old coins waited on Bitcoin Cash. Selling it quietly would be the boring option. RetiredCoder posted [mini-puzzles](https://puzzles.agntn.dev/collections/mini) instead, one for each key, October to December 2024, and let the thread fight for it. Then three more with 0.01 BTC on a fresh key, and in July 2026 a seventh, for 135.

The first three get harder in order. Three swapped hex characters, then twelve shuffled pieces, then a signature whose nonce sat 80 bits from another one. The author's own line on the difficulty: easy "so everyone with minimal skills can solve it", and for hard ones "you already have #67 and #135". A year and a half later, 135 was theirs too, and its key came out through mini-puzzle #7.

## What the record says

Four facts, all from Bitcointalk. The account registration, the post about what mini-puzzles are for, and the two explanations the author wrote when a winner stayed quiet, for #130 and for #7. The second one printed the key of 135. The author record keeps no addresses. The four big BTC solves have theirs on the solver record, and the funding of #4 to #6 stays on those puzzles.

## The record

```ts [src/collections/mini.ts]
static readonly author = party("RetiredCoder", {
  key: "retired-coder",
  kind: PartyKind.Person,
  about: "Bitcoin puzzle solver and author of RCKangaroo who posted seven mini-puzzles on Bitcointalk: the Bitcoin Cash left on four solved puzzle addresses, and 0.01 BTC three times.",
  profiles: [
    profile("github", "https://github.com/RetiredC"),
    profile("bitcointalk", "https://bitcointalk.org/index.php?action=profile;u=3657819"),
  ],
  facts: [
    fact("Registered the bitcointalk account on October 5, 2024.", PROFILE, { date: "2024-10-05" }),
    fact("Wrote that the mini-puzzles are meant to be easy, so everyone with minimal skills can solve them, …", WRAP_UP, { date: "2024-11-15" }),
    fact("Explained the #130 mini-puzzle in the thread after its winner never showed up there.", EXPLANATION, { date: "2024-12-15" }),
    fact("Printed the key of puzzle #135 while explaining mini-puzzle #7, whose winner did not write the solution in the thread: It's not polite.", SEVENTH, { date: "2026-07-29" }),
  ],
});
```


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