Matter Labs/community

Alex Gluchowski

@gluk64

What are you working on?

Adria Massanet

@adria0

Ok, nice, I'll do it.
I'm working in https://github.com/iden3/rust-circom-experimental, just another "toy project to learn rust" that becomes bigger.

Adria Massanet

@adria0

@gluk64 I'm been trying to pass the tests (cargo test) in pairing, but bn256::ec::g2::g2_generator fails for me in B256 release tags (0.16.0,0.16.1,0.16.2) in stable and nightly. Any idea?

---- bn256::ec::g2::g2_generator stdout ----
thread 'bn256::ec::g2::g2_generator' panicked at 'assertion failed: `(left == right)`
  left: `G2Affine { x: Fq2 { c0: Fq(0x0000000000000000000000000000000000000000000000000000000000000000), c1: Fq(0x0000000000000000000000000000000000000000000000000000000000000000) }, y: Fq2 { c0: Fq(0x2b3f3cefd5b17961811cfc2249abeed27cc5cf2d4f4489570c45f1ccbc09d5c8), c1: Fq(0x0c7adfb22a86647eb1ccb21f2c1cb4b4b5394eaf87993b22deb5f230309f910b) }, infinity: false }`,
 right: `G2Affine { x: Fq2 { c0: Fq(0x1800deef121f1e76426a00665e5c4479674322d4f75edadd46debd5cd992f6ed), c1: Fq(0x198e9393920d483a7260bfb731fb5d25f1aa493335a9e71297e485b7aef312c2) }, y: Fq2 { c0: Fq(0x12c85ea5db8c6deb4aab71808dcb408fe3d1e7690c43d37b4ce6cc0166fa7daa), c1: Fq(0x090689d0585ff075ec9e99ad690c3395bc4b313370b38ef355acdadcd122975b) }, infinity: false }`', src/bn256/ec.rs:1413:21

Adria Massanet

@adria0

(also fails for last 0.18.0, btw is not git tagged)

Alexander

@shamatar

It may have been failing from the beginning, I did use test as a notebook/calculator and may have forgotten to remove those

Adria Massanet

@adria0

@shamatar ok!

Jacob Phillips

@JacobPPhillips_twitter

Hey Matter Labs, Really cool project you guys are working on! Other than the ZK podcast, is there anywhere else I can look for more info on the Franklin Network?

LB_mike

@whdqkf88_twitter

Hi!

Antoine De Vuyst

@antron3000

hello, anyone I can ask about the zksync.io tutorial?

getting a jrpc error when I try to read my committed eth balanance

balance*

jenstark

@jenstark

Hi Matter Labs. I'm a curious developer. Looking at ZKSync - focused on the privacy aspect of it. I want to ask a question if you don't mind: I noticed in the transactions on the explorer (ZKSync explorer) that the recipient addresses have 0 transactions onchain? I'm assuming these addresses are "1 off destinations" for privacy/confidentiality purposes to preserve the real identity of the receiving address?

If I were to commit multiple token transfers (separate transactions) to one address, would it show different recipient address on each transaction receipt?

Thanks and happy new year.

Alex Gluchowski

@gluk64

Hi @jenstark, and happy New Year!

Privacy is not in scope of the current version

jenstark

@jenstark

Ok thank you.

Is there a roadmap for ZKSync?

Alex Gluchowski

@gluk64

We will publish updates as they appear

Maciej Zieliński

@zie1ony

Hi. Is it possible to compile bellman_ce as no_std package?

Alexander

@shamatar

No, at the moment Vec type is used a lot and GlobalAllocator trait is not stable to be able to use existing collections in no-std environment. You can nevertheless compile it for WASM if it’s what you are interested in

Maciej Zieliński

@zie1ony

Actually I want to use it as WASM file, but without panic handler.

Alexander

@shamatar

https://github.com/rustwasm/console_error_panic_hook something like this?

Maciej Zieliński

@zie1ony

I use https://github.com/paritytech/wasmi so I can use only no_std.

Alexander

@shamatar

I suppose it’s a part of substrate work? Unfortunately I’m not a wasm specialist

Steve Chen

@scheneclk_gitlab

@gluk64 is it possible to include some arbitrary data in the transfer within ZKSync network? some notes attached to a token transfer?

Alex Gluchowski

@gluk64

@scheneclk_gitlab it will be, but not right now. How do you intend to use it?

Steve Chen

@scheneclk_gitlab

I plan to use it for decentralized token exchange

thecryptofruit

@thecryptofruit

Hi all, kudos for really great project! A quick q: is it planned to run one sidechain to rule them all, or is it envisioned there to be multiple? I take it validators are set in one place on the main-chain. Thanks.

Alex Gluchowski

@gluk64

It's most efficient if there is only one sidechain.

Steve Chen

@scheneclk_gitlab

@gluk64 Can I set up a dev environment and connect to a local POA network (parity Ethereum)?

thecryptofruit

@thecryptofruit

Could you share the idea of how you envision that private txs will be possible in the future? I've read that amounts will eventually be made private, however anonymity of users would require prohibitive modifications, is that still true? Thanks!

Aveesh Shetty

@Aveesh52

Hey

Alex Gluchowski

@gluk64

Could you share the idea of how you envision that private txs will be possible in the future?

The exact scheme will depend on a number of factors. There is definitely utility already in hiding the amounts, although ultimately you need to hide the interaction either. However, level of privacy increases the cost of the transaction. Thus, at the end it will be up to market to see what people are willing to pay for and how far we are with the scalability efficiency by then.

Drygin Alexander

@DryginAlexander

Hello, could you help me to find the implementation of Poseidon_Eddsa for circuit (bellman_ce)? Is it exist?

Alex Gluchowski

@gluk64

@shamatar

@notyourkeys_twitter

Would it be possible to improve on-chain space efficiency by distributing computation of validity proof generation in a zk-rollup? (assuming gained computation power)

@notyourkeys_twitter

Could something like github/matter-labs/snarkyGPU be applicable to something like zkSync?

Nour Haridy

@nourharidy

Hey guys, I've read the Zinc v0.1 docs and I can't find any instructions regarding handling tokens/ETH. Can you help me with that?

Alex Gluchowski

@gluk64

@DryginAlexander https://github.com/matter-labs/sapling-crypto/blob/master/src/circuit/poseidon_hash.rs

@notyourkeys_twitter definitely

@nourharidy The current scope of Zinc doesn't include support for smart contract operations, it is just pure ZKP for now. However, it will be added once ZKP circuit functionality is stable.

Drygin Alexander

@DryginAlexander

@gluk64 Looks like it is poseidon_hash. I am looking for poseidon_eddsa.

Alex Gluchowski

@gluk64

oh, I see. @shamatar ?

Aveesh Shetty

@Aveesh52

Hey

Luke Schoen

@ltfschoen

i can't post in the zinc channel for some reason

I've created a PR that includes a script to help get people hacking faster zpreview/public#2

Benji Richards

@thebkr7

Hey Matter Labs team! Been following from a distance and am just curious as to when you anticipate smart contracts being able to be run?

Petr Korolev

@skywinder

@shamatar @gluk64

Alex Gluchowski

@gluk64

Thank you @thebkr7 -- merged! Please try to relogin, everybody is posting in the zinc channel

Alexander

@shamatar

There was never a Poseidon EcDSA implemented (Schnorr signature to be precise. Keep in mind that EDDSA is very specific protocol). But it’s composable, there is no problem to take the current MuSig implementation and swap sha256 to Poseidon hash

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