Suppose Alice sent some coins to a multisig address. Even if that address is assigned to my wallet I will not see the transaction as it doesn't really belong to me. That's fine, Bitcoin-Qt has no way to show "money in your account but locked by multisig" GUI.
Now, I need the txid in order to sign it (via the API) but how do I find that txid when I am a third party (like an escrow for example) and don't have a trace of the transaction via my wallet like Alice would?
I guess I could monitor the blockchain but that sounds foolish, there has to be a better way.
So: given the multisig address xxx give me all transactions registered for that address.