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114 2017-03-11T19:21:28 <tarantulae> Hi, does anyone have a pointer or some more info regarding the security of using only hash challenge alone for ScriptPubKey ?
115 2017-03-11T19:22:02 <tarantulae> I read that it is not safe, but isn't the security of this guaranteed by a hash function without a known pre-image attack ?
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117 2017-03-11T19:34:57 <arubi> tarantulae, the moment you broadcast the redeem script for such a scriptpubkey, anyone can use the same preimage and re-create a transaction that pays to them instead
118 2017-03-11T19:35:09 <arubi> without a signature, your preimage becomes replay-able
119 2017-03-11T19:37:09 <tarantulae> arubi: it's a matter of timing then right ? there are no guarantees that even if you are the first to broadcast the redeem script, you'll not get it right ? I think I got it.
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121 2017-03-11T19:38:14 <tarantulae> some node may get your broadcast and then keep it hideen and broadcast another one for him with the same pre-image.
122 2017-03-11T19:38:45 <arubi> transactions are only ordered by blocks
123 2017-03-11T19:39:25 <arubi> what happens in between isn't important (ignoring how having free bitcoins 1 might also make re-orgs more profitable)
124 2017-03-11T19:40:02 <arubi> so yes, you can't rely on being first. you have to sign what you relay because that's the only way to keep it from being messed with
125 2017-03-11T19:40:17 <tarantulae> thanks, I got it !
126 2017-03-11T19:40:40 <arubi> that's not to say you can't get away with using only hash functions to sign it, but I don't think there's anything implemented to support that yet :)
127 2017-03-11T19:40:42 <arubi> welcome
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