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ethereum/research

Discussion on Casper, scalability, abstraction and other low-level protocol research topics

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Apr 06 2018 21:05

@holiman banned @PhunioBCC
Oct 21 2017 21:22

@jpitts banned @vickyissabox_twitter
Oct 10 2017 22:29

@jpitts banned @etherchamp2

jon-chuang

@jon-chuang

thanks

Gabriel Rocheleau

@gabrocheleau

Hi people. I was going through the Casper FFG whitepaper (link here: https://arxiv.org/pdf/1710.09437.pdf) and I think I found a few typos /minor mistakes. Who should I forward them to?

Nick Savers

@nicksavers

https://arxiv.org/abs/1710.09437

Virgil Griffith is listed for submission history

Ben Scherrey

@scherrey

I don't believe Virgil can be contacted at the moment. Probably needs to go straight to Vitalik.

Nick Mudge

@mudgen

The Diamond Standard is hot on Reddit right now: https://www.reddit.com/r/ethereum/comments/gze6k3/a_diamond_is_a_set_of_contracts_that_can_access/

1 reply

I am curious what the people in this channel think about the diamond standard: ethereum/EIPs#2535

Gabriel Rocheleau

@gabrocheleau

I don't believe Virgil can be contacted at the moment. Probably needs to go straight to Vitalik.

Yeah that's what I figured. Isn't Virgil in jail or something because of his North Korea talk? I wouldn't want to waste Vitalik's time with typos and minor corrections though. Are you aware of somewhere (e.g. github repo) where I could flag the issue?

Saad rasool butt

@buttsaad44_twitter

I tried to use HD wallet and generate new accounts but i want all of my Coins of new accounts to store in master account(master account will manage all accounts of sub addresses). Is it possible in ethereum?

Jaafar Shhade

@jfrshd

Hello,

I am using bip39 library for mnemonic and keys generation, it works fine, does it use elliptic curve cryptography?
I want to use the same private key with hyperledger fabric blockchain which uses ECDSA, can anyone help me and explain how can I generate a csr certificate using the private key generated by the bip39 library

Micah Zoltu

@MicahZoltu

BIP39 outputs a "seed", which is essentially just entropy that can be used in any key generation algorithm (like BIP32).

The seed associated with a mnemonic is not necessarily a valid ECDSA private key (which has constraints on what a valid key is).

Jaafar Shhade

@jfrshd

I think I have some misunderstandings on some concepts, so bip39 is just for generating the entropy, but another seperate key generation algorithm is used to generate the keys, like BIP32/BIP44/BIP49/BIP84/BIP141.... Does ethereum require a specific algorithm among these ones I listed?

Micah Zoltu

@MicahZoltu

For an Ethereum account, you just need a valid secp256k1 private key. How you get that key is not relevant to the core protocol.

BIP39 takes a mnemonic and turns it into entropy. BIP32 turns entropy plus a derivation path into a valid secp256k1 private key.

Jaafar Shhade

@jfrshd

Aha, thanks for the valuable explanation.
So I have found earlier a library the generates ECKeypair using ECCurve_prime256v1 and then it creates a csr certificate, so should I edit it to use secp256k1? will it be able to generate the csr certificate? or prime256v1 doesn't work with certs, and please can u explain a little bit about prime256v1 and secp256k1, I searched about them but that wasn't enough

Micah Zoltu

@MicahZoltu

I'm not familiar with a CSR certificate, so I can't help with that.

Jaafar Shhade

@jfrshd

Thank ypu for help

Ghost

@ghost~5e9b5adcd73408ce4fe0ea4c

Hi, I am reading the Gapser paper here, it defines safety as

safety, if the set of finalized blocks F(G) for any view G can never contain two conflicting
blocks. A consequence of having safety is that any validator view G’s finalized blocks
F (G) can be “completed” into a unique subchain of F (view(NW)) that starts at the genesis
block and ends at the last finalized block, which we call the finalized chain.

What I don't get is, it seems trivial to have no conflicting blocks. Given a view, here it means a tree of blocks, just choose any chain to be the finalized blocks, then there is no conflict anymore. How can this be considered "safety"?

Lana Davis

@Lana_davis_gitlab

Hello

qsmen

@qsmen

to check if a transaction is already in the blockchain, calculate its hash and check if the hash is in a list which is already constructed to indicate the existence of the existing transactions. My question is the size of the list is over 2 billion, too large. The list will take too much RAM. How to solve it?

qsmen

@qsmen

if the question above is a problem?

Micah Zoltu

@MicahZoltu

You could use a bloom filter if you don't need 100% accuracy.

qsmen

@qsmen

Thank you, Micah. Does ethereum use a bloom filter to check if a transaction exists in one blockchain and prevent replay attacks?

Micah Zoltu

@MicahZoltu

No. Bloom filters are probabilistic data structures, they don't give strong guarantees.

If all you want to do is ensure that a transaction is "valid for inclusion" then you can just check the user's nonce in state and see if the nonce in the transaction you have is 1 higher (more than 1 higher may eventually become valid, but aren't yet valid).

qsmen

@qsmen

Thank you, I see almost. An address or an account will have the nonce field for comparison?

Micah Zoltu

@MicahZoltu

If you have access to state for the blockchain as of a particular block, you can get the accounts current nonce, and compare that against the transaction you have to determine validity.

qsmen

@qsmen

nonce get increased 1 higher each transaction, not random

Micah Zoltu

@MicahZoltu

Yes, exactly.

Every transaction from an account increments the account nonce by exactly 1, and no nonce can be used twice, and you cannot skip a nonce.

qsmen

@qsmen

ok,ok. thank you

Micah Zoltu

@MicahZoltu

So an account's first transaction is nonce 0, second is nonce 1, third is nonce 2, etc.

qsmen

@qsmen

i see,

Micah Zoltu

@MicahZoltu

So if you lookup an accounts nonce and get back 1, that means the next valid transaction from this account MUST have a nonce of 1.

qsmen

@qsmen

ok, I see. a simple way to prevent replay attack under the condition the bit size of nonce is long enough

Micah Zoltu

@MicahZoltu

:thumbsup:

qsmen

@qsmen

Lana Davis

@Lana_davis_gitlab

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George Balch

@polydin

heyo can anybody tell me if eth2 is based on the casper paper?

is there any formal paper on the maths behind eth2?

k nvm lol bye

Ethamoto

@Ethamoto

Guys I have been reading about EIP 1559 and the replacement of gas fee with a base fee. I have a question - How does EIP 1559 deal with the halting problem? Running out of gas whilst processing a transaction currently solves the problem of infinite loops as I understand it. But if the base fee model doesn't have gas then how is the halting problem mitigated?

kassw

@kassw

Hello everyone I am Phd student and am looking for some answers could someone help

I wanted to know if its possible to have a blockchain based program that works with traditional currency while having a wallet that pays the gas?

fama

@nagarajmanjunath

hi everyone, I have used tender mint consensus engine. It is proof of stake and uses the weighted round-robin algorithm to select the proposer. Is it same in Ethereum’s Casper design also?

Amirjab21

@Amirjab21

Hi, does anyone know how we can manipulate the value of msg.value when testing Solidity contracts on the remix IDE? msg.value is always set to 0 and I can't seem to change this on testing

Marius van der Wijden

@MariusVanDerWijden

On the deploy and run tab, there's a value field (below gas limit) that you can use to specify msg.value

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Albert Su

@AlbertSu123

In casper, do voters validators vote on every block or only every 100 blocks?

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