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From: Peter Todd <pete@petertodd.org>
Date: Wed, 13 Aug 2014 11:10:32 -0700
To: Richard Moore <me@ricmoo.com>,
	Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Message-ID: <d2f135de-16cc-41df-8ec5-de3089cf3741@email.android.com>
Subject: Re: [Bitcoin-development] Another weird transaction question...
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On 13 August 2014 11:00:22 GMT-07:00, Richard Moore <me@ricmoo.com> wrote:
>Hey all,
>
>Sorry to keep bugging you all, as I slowly verify the blockchain one
>transaction after another with my own implementation, but I have found
>another transaction that is obviously correct (as it is verified by the
>legit client) that has me seeking clarification.
>
>This multisig output script:
>
>https://blockchain.info/tx-index/12809044/0  (txid:
>274f8be3b7b9b1a220285f5f71f61e2691dd04df9d69bb02a8b3b85f91fb1857)
>
>contains a public key:
>
>00f2b7816db49d55d24df7bdffdbc1e203b424e8cd39f5651ab938e5e4a193569e
>
>Are invalid public keys permitted and silently ignored? Or does the
>0x00 prefix have some interesting meaning?

Have you looked at the Bitcoin Core script test cases yet? You might be surprised at what is allowed. Equally, read the source code! In particular follow the block acceptance logic line by line from start to finish.

In any case, the Bitcoin protocol doesn't care whether or not a public key is valid.
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