PSA: CoinSpace/CoinWallet v3.0.7 (2021) has a derivation bug that made it provide the WRONG seed phrase. My recovery script inside.

Seen some past posts that people had lost their wallets and this might help those people!

If you created a wallet with CoinSpace (now Coin Wallet) around early 2021 and your seed phrase generates a completely different address in MetaMask or any standard tool... you're not crazy. The software had a bug.

CoinSpace v3.0.7 (and maybe other versions) incorrectly derived wallet addresses from your seed phrase due to two compounding errors in the code. Your seed phrase can be recovered - but not using it directly. the app just used a broken algorithm to turn it into an address, one that no standard wallet tool replicates.

CoinWallet is aware of part of the issue and will point you to a derivation path fix if you report it, but that fix alone doesn't work. The recovery script in the repo handles it correctly.

I hit this when I needed to recover 1.55 ETH from a wallet I created in Feb 2021. After weeks of forensics I found the bug and wrote a recovery script.

Recovery script: https://github.com/RobMulla/coinspace-eth-recovery

Full long writeup about my journey: https://robmulla.substack.com/p/how-my-sons-roblox-mod-helped-me

If you're affected, and this works for you please let me know! Or if you knew about this already... I'm curious to know if I'm not the only one.