notes/script: explain ksd5's lost key

notes/script/67724d3f7766cb12faf80766c8c8f880b1e6d0bfc735f59149341956526a725c.md

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+### ksd5's Lost Key
+
+On July 14th, bitcointalk user `ksd5` created a thread[^1] trying to trace BTC sent to a change address.
+
+It emerged that while trying to test double spend protection, the user inadvertently overwrote the `wallet.dat` file containing the private key to a change address which held their 1.2 BTC balance.
+
+While the address is not explicitly stated in the post, enough information is provided to enable us to trace the transaction and address involved[^2].
+
+[^1]: https://bitcointalk.org/index.php?topic=359.0
+[^2]: https://raghavsood.com/blog/2024/06/25/bitcoin-archeology-120-btc-lost/