I just saw this and I can't stop laughing now. Do you think any reasonable casino/company would accept your electronically generated Bitcoin payments? Stop dreaming, bro. There are laid down rules and if at all the casinos ask you for a financial statement or proof of income source, they refer to your bank/card statement that will reflect enough for them to see.

As it is now, your sure bet is to contact your employer if your earnings are in Bitcoin, who knows, they might have the internally generated means to back your claim with the casino.