On pull request https://github.com/bitcoin/bitcoin/pull/220 say will be possible to import/export keys. I would like to know if will be possible to have the same key on different wallets and only be able to spend the bitcoins from this key with permission of the other users that has this same key on the wallet. Example:
- I have a key on my client with 10 BTC.
- I export this key and send to a friend
- The key will be on my wallet and on my friend wallet
- When I or my friend try to spend the bitcoins from this specific key, will be requested a password asking if we accept the transaction.
Will this be possible on next Bitcoin versions?