2015-10-30 00:53
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 |
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<
bramc >
So I had this funny idea about keeping the utxo set size under control
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<
bramc >
The idea is that you impose a cost on adding an entry to the utxo, but then return it when the entry is removed. It's calculated by number of bytes, so adding something to the utxo set costs, say, 100 bytes towards the block size limit. If you remove one you get an extra 100. Most transactions have one input and one output so they cancel out
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<
belcher >
im not sure about the last point, many many transactions have two outputs (destination and change)
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<
belcher >
but that doesnt change your argument
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<
bramc >
The interesting question comes in how you handle cashing old dust - it's a bit of a pain to coordinate with other transactions which should happen. But then I got a crazy idea: How about allowing transactions to have negative miner fees? Then the miner can let the transaction through and collect more fees from other transactions which get allowed in
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<
mmeijeri >
@bramc: Ripple does something like that
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<
bramc >
Allowing negative fees seems like a strange idea but makes a lot of sense. There's no particular reason why they couldn't be allowed
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bramc >
A slightly stranger idea: It seems like some of amiller's recent smart transaction stuff runs into problems related to not being able to predict later transaction ids. Why does a transaction need to include its inputs when calculating its id? That might require some salt under some circumstances, but it doesn't seem to have any real security problem, and it makes a lot of smart transactions unambiguously simpler
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<
bramc >
Both of these are probably not soft-forkable
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<
kanzure >
SIGHASH_NOINPUT?
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kanzure >
as for soft-forkability there's some tricks you can do with anyonecanspend
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bramc >
kanzure Also there should be a sighash type which signs one input and all the outputs, but that doesn't fix the txid problem
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bramc >
Or maybe the smart contracts can by having the signatures still be valid despite the input txid changing, thus pushing the problem back a level
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bramc >
I'll need to understand the contracts better before having an opinion on that.
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<
bramc >
checking none of the inputs seems dodgier than verifying just the one input, but maybe it's fine
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