In sheercoin, we could make it so that both Alice AND Bob need to sign the transaction for it to be valid. This would require a little bit of extra effort for the users, as the transaction signed by Alice must be sent to Bob for signing before being broadcasted to the network.
How do we send transactions in anonymous p2p-network if not by broadcasting to all nodes?
- No coinbase messages
- No scripting at all, in fact
Sounds like challenge, wishing luck!