Thinking about MtGx and particularly Bitstamp. Maybe there is a need for a new type of wallet.

Bitstamp seem to have being doing everything quite well, keeping most of the funds in offline wallets. The money that was hacked was from a hot wallet. Petty cash, if you like, which they would understandably need to have easily accessible and in a hot wallet for operational reasons.

But did it need to be an 'instant' hot wallet?

What if we had a new type of wallet, that was a type of multisig wallet. Delayed transaction multisig wallet.

Transactions initiated with this type of wallet would not be executed immediately, but would always be marked for processing, in X blocks (36 for 6 hour delay, 72 for 12, 144 for a day). The ability to post date transactions is already built into bitcoin, so would just be a matter of having a special case of multisig.

If the owner of the wallet noticed that an undesired transaction had being placed, they would be able to use a separate signature to mark the transaction as invalid.

Use case is for people and companies like Bitstamp who want to have monies in hot wallet and are happy to forgo instant transactions in their wallets, in the interest of extra security and a chance to undo transactions within a certain timeframe. Like a half way house in terms of security between an offline wallet and a hot wallet.

What do you think?