i am currently also develping BIP11 support for BitcoinJ as a followup from the Berlin Hackathon:
http://code.google.com/r/andreaspeterssonat-hackathon/source/checkout
Gavin, are you referring to BIP16 with this text?
http://code.google.com/r/andreaspeterssonat-hackathon/source/checkout
Gavin, are you referring to BIP16 with this text?
Yes-- bitcoind creates BIP16 multisig transactions (using BIP13 addresses). Because a BIP16 transaction doesn't reveal public keys until the first spend, if an attacker has only one of the public keys (and the multisig address has been funded but never spent) they won't be able to figure out that the key is helping to protect a large multisig-protected balance.