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From: Peter Todd <pete@petertodd.org>
Date: Wed, 01 Oct 2014 17:12:51 -0700
To: Gavin Andresen <gavinandresen@gmail.com>, Alan Reiner <etotheipi@gmail.com>
Message-ID: <72667BA8-FDE6-4C6B-A463-9DFAE067C287@petertodd.org>
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] [BIP draft] CHECKLOCKTIMEVERIFY - Prevent
	a txout from being spent until an expiration time
Precedence: list

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On 1 October 2014 14:34:33 GMT-07:00, Gavin Andresen <gavinandresen@gmail.com> wrote:
>On Wed, Oct 1, 2014 at 5:04 PM, Alan Reiner <etotheipi@gmail.com>
>wrote:
>No, the burner would supply the funding transaction plus the redeeming
>script as the proof-of-burn to whoever needed the proof.

No, the redeemScript has to be provably published to miners for the sacrifice to be valid; if not you can exploit the scheme by hiding the redeemScript and having a big miner mine it at lower-than-face-value cost when it unlocks.

>Only after at least one confirmation, if there was some risk that
>revealing
>the redeeming script would make miners refuse to mine that first
>transaction because they want to get it plus the CHECK TIME BLOCK VERIFY
>"burn"
>transaction.

Yes, you could do that in a followup tx containing the redeemScript in an OP_RETURN output to prove publication. That said as I said to Luke-Jr, the sacrifices need to unlock pretty far into the future, so I don't see miners bothering to do this.


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