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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<barubaru>
Is there something that i can read about how to avoid central server and full sync of blockchain and still being able to prevent double spending?
<barubaru>
Or in other words: is there a way to make a system where not a single node has full information but double spendings are prevented?
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<bsm1175321>
Not yet. Some of us are working on that.
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* nsh
frowns
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<nsh>
can you even do mining without a roughly total state?
<nsh>
maybe rolling blocks in the way we do coinjoin tx's
<nsh>
but sounds like an orchestration nightmare
<nsh>
i think there's some distributed systems inescapableness here which requires some kinda compromise of economic hack again
<nsh>
*or
<bsm117532>
nsh: You need to attach unspent-proofs to the transaction itself in order to mine. So two easter bunnies required: utxo set commitments and a mechanism to shard and collect proofs.
<bsm117532>
But, if you don't have the whole UTXO set you're at a (slight) disadvantage with respect to a miner who does, because if you don't have to go poll your peers for proofs, you can start mining on a new txn earlier.
<nsh>
right
<bsm117532>
This is basically the way Zcash works (without the sharding bit)
<bsm117532>
The spender is responsible for creating these proofs...
<bsm117532>
In a sharded scenario, I don't see a problem with the spender being required to gather the proofs before broadcasting his txn to be mined...
<nsh>
it would facilitate correlation and denial of service, but it's not too pathological
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<bsm117532>
Hahaaaaa can you elaborate? I'm not sure what you mean?
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<nsh>
well, if you track enough proof solicitation requests it might assist in deanonymisation. and if you frustrate them [by partitioning] then spending is denied
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<bsm117532>
De-anonymizing of IP's? Because the txn/proofs by themselves don't add any information that isn't already in the transaction graph.
<bsm117532>
I kind of envision that service/wallet providers would perform this service, in general, not people's individual wallets.
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* nsh
nods
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<JackH>
does anyone know the economics of Ethereum in terms of: how much does it cost to fill 1MB in the blockchain?
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<JackH>
!topic
<gribble>
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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