Why not simply AES-256 encrypt the private key and be done with it in, like, 3 lines? No password hashing and so on.

I solved puzzle #66 but I'm very afraid to sweep it. Since no one claimed it yet, they definitely belong to me, right? Here's my proof: the encrypted private key is:
First 16 bytes are the IV, then 32 bytes of private key. I removed the padding, since it's 16 bytes of 0x10 (e.g. no bytes in last block).

If anyone steals my prize I will divulge the decryption key.