sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja
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<Sentineo>
maaku: ah ok thanks (regarding the hash singularities). Are those hashes checked, e.g. when there is a p2sh is core checking is the hash hashes to itself again? Perhaps as a sanity check to rule out the possibility? Well for a p2pkh one would need a signiture, so it is fine (imho) from singularities. What about p2sh? A simple data push is considered a valid script, is it not? So finding a
<Sentineo>
ripmed160 singularity could allow me to spend those funds, right?
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<abomb>
Sentineo, the neat part about that would be if the wallet had a previous transaction and after its accepted you can show you broke ripemod160 because of the two different public keys on the blockchain
<abomb>
and there is 256 bits worth of private keys, and 160 bits of ripemod.... around 79228162514264337593543950336 times smaller of a search space.....
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<Chris_Stewart_5>
It seems to me that a hash is just provided in both cases?
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<Chris_Stewart_5>
and that hash is used to calculate the hash of the parent node?
<sipa>
Chris_Stewart_5: VERIFY means it's a node you want to prove inclusion over
<sipa>
SKIP means you just need to provide the hash to make the root validate
<Chris_Stewart_5>
ahhhhhh
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<instagibbs>
"SKIP means the branch contains a hash of an elided subtree or element, and the fast-SHA256 root hash of this subtree or double-SHA256 hash of the element is included in the proof structure; and VERIFY means the branch contains an externally provided hash that is needed as witness for the verification of the proof"
<instagibbs>
from the text
<Chris_Stewart_5>
i think the VERIFY wording is confusing
<instagibbs>
i just skimmed for the definition, haven't spent any time digesting
<Chris_Stewart_5>
"means the branch contains and externally provided hash" -> "means the node should match a hash we are trying to prove is included in the MT"
<Chris_Stewart_5>
IMO
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<maaku>
correct. SKIP hashes are serialized inside the proof. VERIFY hashes are taken individually from the stack in MERKLEBRANCHVERIFY
<maaku>
you need both the proof object (containing the tree structure and all of the SKIP hashes) and a list of the VERIFY hashes to reconstruct the root
<Chris_Stewart_5>
maaku: Ok I get the idea, I just found the VERIFY definition confusing. Might want to change if other people have trouble with it as well
<Chris_Stewart_5>
especially the usage of 'branch' as, to me, that implies there is a child tree provided
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