Questions tagged [layer-2]
The layer-2 tag has no usage guidance.
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Can Arbitrum's block timestamp be trusted to the same degree as the L1 time?
L1 blocks cannot be fudged by validators. It is a value that can be safely used by apps.
Can that be said about the value of block.timestamp on a L2 like Arbitrum?
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In optimistic roll-ups, can a validator post a valid block that builds on an old-but-invalid block which was not challenged?
In optimistic roll-ups, blocks (aggregated transactions) are published on the Ethereum main net. The main net functions as a security layer for the roll-up in the sense that it leverages the security ...
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Optimistic rollups and simple transactions
My understanding is that in an optimistic rollup, all data from users authorizing a transaction is stored on L1. The computation itself corresponding to that transaction is executed on L2.
For simple ...
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Why does rollup data in Ethereum have to be on chain?
In this blog, it is said
Rollups move computation (and state storage) off-chain, but keep some
data per transaction on-chain.
The fact that data is on-chain is key (note: putting data "on IPFS&...
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Would this library be interesting to dApp developers for in-browser wallet?
I'm with INTMAX, developing webmax.js, a JS library for quick dApp integration with our in-browser web3 wallet that's secure, uses biometric authentication, & supports EVM-compatible / Layer 2 ...
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Creating ETH Sidechains
I have been looking online for a resource that helps me how I can build ETH sidechain and Layer 2
How can i use the ETH blockchain and make it a sidechain are there any tutorials or guides ?
Do i ...
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Where do arbitrum gas fees go?
Similar question to here except, based on the arbitrum docs:
⚠️ Note: There is no protocol level incentive to run an Arbitum full node.
I know the sequencer gets paid some amount of the fee, but I ...
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Does arbitrum / optimism / other L2s have MEV?
Due to the fact that the sequencer is the "real" node that sequences transactions, I would imagine that is the true MEVer...
But for example, could I run an Arbitrum node and MEV some ...
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Are there any Ethereum L2 projects that built based on the Parity Substrate framework?
Substrate is a powerful framework that makes it easy to build a blockchain. I am more familiar with the substrate development than the Layer2. and am curious about why there are no Ethereum Layer2 ...
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why does optimism need to derivation from L1 but zk-rollup scheme like polygon zkevm not?
recently I am reading the optimism docs and the spec named derivation confuse me.
I haven't found it in any docs of zk-rollup projects like zksync, Polygon, or zkevm.
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How to calculate "amountOutMin" on some DEX-es?
There's a function in a contract on HOT-protocol exchange
sendToL2( uint256 chainId, address recipient, uint256 amount, uint256 amountOutMin, uint256 deadline, address relayer, uint256 relayerFee )
...
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Polygon (MATIC) is a Coin or Token?
If polygon is a Layer-2 solution is built upon Ethereum then why it is listed as Coin in coinmarketcap intead of as Token ?
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Ethereum Bridges , Layer-2 , Sidechain ,Offchain ,Crosschain Interoperability
I'm confused with all these terms Bridges , Layer-2 , Sidechain ,Offchain ,Crosschain Interoperability .Are these the scaling solutions for Ethereum ?
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How to transfer coins between L1 and L2 via web3.js or ethers.js?
How to do it? Programmatically.
Does it always require a bridge? Or can it be done in other way too?
I haven't found any difinitive answer to this anywhere.
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How does one create and send TXs on L2 - Arbitrum and others?
In ethers.js or web3.js
How does one create and send TXs on L2 - Arbitrum and others? Is the algorithm absolutely identical to the one on L1, or not?
How does one transfer ETH between L1 and L2?
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Differences between on zkEVM and zkSync ERA
Are polygon zkEVM and zkSync ERA somehow different? If yes then how?
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Am i right on this? [closed]
Do I just need to deploy my contract on Base chain testnet to use its layer2 solution? Or there is other steps? It is too confusing for me, Please guide me on this.
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Queries on Base Chain layer 2
I am a web3 developer and want to use Base Chain layer 2 solution for my contract, but i am little confused.
Does just deploying on base testnet enables all benefit of layer2?
How to use Base ...
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Need advice on using layer 2 in dex
I have created a Dex, I want to use its swap and providing liquidity functionality through layer 2, how to do that? If u answer with code example then it will be very helpful for me, I can understand ...
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I need help on using Base chain by coinbase
I wanna use Base chain in my dapp, but i could not get the documentation handy,
I did not understand how i use the bridge contract address.
Does configuring my hardhat.config.js as advised in ...
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Both L2 and gasless
I need a network that is both L2 (Validium or ZK-rollups) and provides a gasless platform (for the L2 smart contracts).
Which L2 networks provide such the capability?
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How to store temporary state change without committing to block?
I want your suggestion..
I want to inject (using python for e.g.) a transactions every 10 seconds.
function makeTransaction (uint _value)
I am externally interacting with the contract...
...
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How to run a permissioned/private L2?
I am looking for a low-effort way to run a private/permissioned L2 that allows me to issue ERC-20 tokens privately. Then, occasionally, I want to bridge those to L1. Any projects out the to help with ...
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use of operator contract in ZK rollups
i understood why 2 smart contracts are deployed in mainnet, but don't understood why an operator contract is deployed in layer 2 chain in ZK rollups.
what does this smart contract do exactly ?
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works of sequencer in rollups blockchain aka layer 2. does sequencer and relayer are same ? how to make decetralised sequencer?
I guess, the work of sequencer of L2 rollup chain is to minify transactions and sends them to L1.
What are the other works of sequencer and how does it exactly works
where is it hosted.
I gues ...
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are there any other off-chain scaling solution then layer-2?
I was reading this: https://ethereum.org/en/developers/docs/scaling/#off-chain-scaling
my doubt is: are there any other off-chain scaling solutions then layer-2. Can a centralised, non-blockchain ...
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What is the best L2 solutions for zero value data addition transactions?
I am looking for a rollup (or any other L2) solution that supports simple data addition transactions for a Ethereum Smart Contract. The smart contract just maintains a table and we have addRow and a ...
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Getting {"code":500000} in response of LoopringAPI.userAPI.submitInternalTransfer #64
sdk` and following the doc for transfer-erc20.
When transferring the eth using the mock accounts LOOPRING_EXPORTED_ACCOUNT its working fine but when I am using mainnet eth accounts I am getting the ...
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Arbitrum: Mapping L2 blocks to L1 batches using RPCs
I'm looking for a way to programmatically map L2 blocks to their corresponding rollup batches in L1 using RPCs.
Is there a way to do this, and if so, what would be the best approach? Any help or ...
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Sign and send signed transaction in L2 zk-Rollup
I own an ERC20 token on the Ethereum mainnet but as everyone knows the fees are very high would it be possible use L2 zk-Rollup with this methods below?
Example transfer(), estimateGas(), ...
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How much ether should a bridge hold in reserve to cover gas costs?
DeFi bridges often run non-profit like the Matic bridge, which bridges Ethereum layer-1 to Polygon layer-2. Some bridges like zk roll-ups that bundle transactions together even cover the gas fees for ...
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How can privacy roll-ups like Aztec make my transfer cheaper?
Aztec or zk.money, a Layer-2 roll-up, claims to make transactions not only private but also cheaper.
If I send 1 eth on L1 mainnet, all I pay is one gas txn to send it.
If I instead use Aztec's ...
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Will Layer-2s and zk roll-ups become redundant once Eth 2.0 sharding and scaling arrives?
Millions of VC funding dollars are going into Layer-2 solutions like Optimism, Arbitrum and Polygon to allow users to side-step mainnet Layer-1 and process transactions at a thousandth of the cost and ...
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How does one get the balance of an ETH address on Arbitrum or other L2's using eth-cli commands?
Using eth-cli how do I access the balance of an address on L2's such as Arbitrum, Polygon, etc....
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How to deploy smart contracts to any arbitrary available address like it was done through a regular transaction on Optimism?
Well, I’m not talking about the mainnet but an ᴇᴠᴍ compatible ʟ2 still using an Ethereum smart‑contract for storing its state : Optimistic Ethereum.
A recent contract creation on Optimism seems to ...
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What is difference between ZK Rollups and Polygon?
ZK Rollups and Polygon mainnet are both layer 2 solution built for ethereum scaling solution. So what's the difference between these two solutions and which one to prefer?
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How do I calculate the transaction fee on the Optimism network
I have this transaction hash
https://optimistic.etherscan.io/tx/0x9b8f0d63adb5c633baff74b642331d0015ea207134bd3f7f526a9b89d5dfae27
How did optimism calculate the 0.05c USD transaction fee
Can someone ...
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is layer0 and layer-1 blockchain both mainnet?
I want to ask here a fundamental question about the difference between layer 0 and layer 1 for my understanding. i have read you can create main blockchains on layer 1 which lacks scaling. while the ...
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web3js returns empty array on getPastEvents on polygon, optimism and arbitrum
I have a problem getting past events of a contract on polygon, Optimism and Arbitrum.
the same code works perfectly on ethereum but for some reason i cant get it to work on
polygon, OP and ARB.
I have ...
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Can you make one transaction on mainnet that initiates a transaction on a layer 2?
I was going through some grants/RFPs and I noticed an interesting request. They are looking for a solution that allows a user to make a single transaction on mainnet to deposit funds into a protocol ...
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How can i retrieve the list of ERC20 tokens bridged to other evm chains?
Is there is a way (preferably not relying on an external API) to retrieve a list of tokens bridged to L2 or other EVM chains corresponding to a token on the Ethereum mainnet.
I thought of parsing ...
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Where are layer 2 transactions (e.g. on Loopring Exchange) actually processed?
If you transact directly on Ethereum network - I get that your transaction is (eventually) processed by the 'world computer' of a load of miners running the Ethereum node software.
If you do a ...
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Understanding data availability for zk rollups
My understanding is that if a zkrollup operator suddenly ceases operation, you have to sync the rollup’s history from genesis to get the current state. In other words, if the transaction data has been ...
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What is the current state of zkEVM development?
What is the current state of zkEVM? That is - a general-purpose (not specialized like Loopring or Immutable), EVM-compatible, Solidity-compatible zk-rollup layer 2. To my knowledge they are still ...
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Transferring weth from my contract to an other wallet address on polygon without using bridges
I have a requirement where we are building a platform that receives funds on Ethereum L1 and sends that fund back to the same address on polygon L2. I know bridges are there to transfer funds from l1 ...
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Sending message/instruction from a governance system on Arbitrum to mint tokens on mainnet using Gnosis Zodiac Bridge
I am working with a DAO that has their governance/voting system on Arbitrum, and their Gnosis Safe treasury wallet on mainnet.
The Gnosis Safe on mainnet contains minting keys to mint their native ...
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call a view function from a L1 contract in a L2 contract
I'm wondering is there a way to read a view function that is deployed on L1(Ethereum) on L2(e.g. Optimism) and vice-versa
pragma solidity ^0.8.0;
// pretend this is on L1
contract L1_contract {
...
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Does a Rollup transaction need the parameter 'nonce'?
Recently I am learning Rollups, and one thing makes me confused is that, Does the compressed transaction in a batch need the parameter nonce?
Here in on-chain-scaling-to-potentially-500-tx-sec-through-...
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Is Polygon (Matic) a layer-2 or a sidechain?
People are calling Polygon both a layer-2 and a sidechain even though these are 2 different concepts. Which one is it?
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Questions regarding Polygon Network Mapping
In order to map (to Ethereum) ERC721 Tokens that have been minted with my Smart Contract deployed on the Polygon Network:
Do I need to deploy my Smart Contract on both networks (Polygon and Ethereum)?...
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