OP there's no way you can prove this is not happening:
Selling a wallet.dat file instead of asking for help is extremely suspicious.
I strongly recommend not deal with OP.
- You create a new wallet.dat
- Encrypt it with a random password extremely long, impossible to crack
- Send 23 bitcoins to it
- Sell the file. You can safely send first or use escrow
- Once you get the 0.5 BTC create a new account and sell the wallet again
- And again and again
- Finally move your 23 BTC with the password you had all the time
Selling a wallet.dat file instead of asking for help is extremely suspicious.
I strongly recommend not deal with OP.
That's a possibilty but its not the case here, I can only give you my word...
If anyone is interested contact me