Regarding the June 27 giveaway, has their been any clarification from the Stellar Foundation re P2SH bitcoin addresses, which are commonly used to implement multisignature?

I'm involved in a fund that uses a 2 of 3 multisignature address. Will we need 2 signatures for proof of ownership to claim Lumens? Signatures from all 3 private keys? Or do we need to move to an old fashioned bitcion address starting with "1" where there's only one key pair before June 26?