8
votes
Is Polygon (Matic) a layer-2 or a sidechain?
Short Answer:
Polygon PoS can be considered as a combination of sidechain and layer2 solution because it is a separate chain that has its own consensus mechanism but also uses the main Ethereum layer ...
- 171
6
votes
Accepted
Is Polygon (Matic) a layer-2 or a sidechain?
A blockchain doesn't exclusively have to be one or the other - it can be both a sidechain and a layer-2. They aren't opposites.
A sidechain refers to a blockchain which has it's own consensus ...
- 206
4
votes
how does optimistic rollup work?
There are many details to optimistic rollups. Nika's example can be used to explain some of the main ideas.
10 ETH is locked on L1
Note that the L1 rollup contract does not know that the 10 ETH ...
eth♦
- 86.5k
4
votes
how does optimistic rollup work?
Since L1 contract doesn't verify anything about submitted blocks apart from some basic stuff, a malicious sequencer can do all kinds of nasty stuff, like for example adding an invalid transaction that ...
- 171
4
votes
What exactly is Ethereum's Layer 2
Layer 2 means any scaling mechanism that isn't programmed into the Ethereum protocol, i.e. it has no specific effect on consensus. This includes state channels (which Raiden would fall under), Plasma, ...
- 12.2k
3
votes
Is Polygon (Matic) a layer-2 or a sidechain?
A significant difference between layer 2 and sidechain -
Sidechains have security mechanisms of their own.
Layer 2 solutions derive their security from their parent blockchain while using their own ...
- 96
3
votes
Accepted
Does smart contracts "sync" between Polygon and Ethereum?
1 - Do I have to redeploy the contract on the Polygon network or does it automatically sync with the Ethereum Mainnet after it is deployed?
Polygon and Ethereum are separate blockchains and do not ...
- 23k
3
votes
Accepted
How to broadcast a transaction directly to a centralised sequencer (Arbitrum/Optimism/others)
You can send transactions directly to the sequencer by using their RPC url. These RPC only support eth_sendRawTransaction (or eth_sendRawTransactionConditional), so for example you can't use them to ...
- 3,927
2
votes
Any Solidity-based sparse merkle tree implemenations in production?
The ETH 2 deposit contract implements a sparse Merkle tree that holds $14B of Ether at the time of writing this answer.
- 31
2
votes
Accepted
How to deploy smart contracts to any arbitrary available address like it was done through a regular transaction on Optimism?
I found the reason how Optimism was able to reserve both the 0x4200000000000000000000000000000000000014 and 0x4200000000000000000000000000000000000042 contract addresses, even though they deployed to ...
- 4,639
2
votes
Differences between on zkEVM and zkSync ERA
ZkSync Era uses its LLVM compiler, which compiles code from various popular EVM languages such as Solidity, Vyper and Yul to run on their custom zkSync VM. This compiler will be further developed to ...
2
votes
Are there any Ethereum L2 projects that built based on the Parity Substrate framework?
There is an project called Madara which is a Starknet sequencer, based on substrate.
- 121
2
votes
Accepted
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...
Correct.
But for example, could I run an Arbitrum node and MEV ...
- 1,178
2
votes
In optimistic roll-ups, can a validator post a valid block that builds on an old-but-invalid block which was not challenged?
The best answer is probably "undefined". Before speculating on an answer, it is important to state the 2 main assumptions of an optimistic rollup:
a trust model of 1-of-N: there are many ...
eth♦
- 86.5k
2
votes
Accepted
Optimism L1 fee calculation
The QuickNode formuala given above is roughly correct but misses a few details.
If we look at the GasPriceOracle.sol contract's getL1Fee() method we can follow _getL1FeeEcotone() since Ecotone is the ...
- 642
2
votes
Accepted
Error Starting op-geth Node with Archive Mode: "incompatible state scheme
The issue was resolved by adding the --state.scheme=hash flag when initializing the genesis block. Here's the updated command that worked for me:
build/bin/geth init --state.scheme=hash --datadir=...
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1
vote
How does one create and send TXs on L2 - Arbitrum and others?
The algorithm should be the same because every L2 Ethereum chain works with the EVM (Ethereum VIrtual Machine). It is the algorithm every L2 ethereum chain uses
1
vote
Accepted
Queries on Base Chain layer 2
if you want to use Base protocol addresses, L1 contract addresses, and L2 contract addresses, you will need to use Base Chain JS SDK or another compatible Ethereum development kit.
Here is the general ...
- 604
1
vote
Accepted
are there any other off-chain scaling solution then layer-2?
I would say the actual definition of a "layer 2" varies a bit. Some sources say it should be a real blockchain which utilizes layer 1 for security. I think it's generally agreed that it ...
- 30.2k
1
vote
Accepted
How can privacy roll-ups like Aztec make my transfer cheaper?
Transactions from L1 to Aztec are not cheaper - you have to pay the regular L1 transaction fees.
Aztec uses zk-rollup technology. On top of that, they use real ZK (which they tend to call zk-zk-rollup)...
- 30.2k
1
vote
Accepted
Will Layer-2s and zk roll-ups become redundant once Eth 2.0 sharding and scaling arrives?
Now this is just my speculation, but I don't think L2s will disappear. There is no way to get all three components right of the blockchain trilemma: security, decentralization and scalability. ...
- 30.2k
1
vote
Will Layer-2s and zk roll-ups become redundant once Eth 2.0 sharding and scaling arrives?
Here is my theory:
If Ethereum gas fees become as cheap as ie., today's Polygon:
New Dapp devs will turn a blind eye on L2 and just build new systems in Ethereum, the reason is simple; Market ...
- 668
1
vote
Accepted
is layer0 and layer-1 blockchain both mainnet?
Layer 0 methods, or network layer methods, are where the mechanism to improve interoperability and scalability operate at the network level of the blockchain architecture stack.
Layer 1 methods are ...
- 4,308
1
vote
Accepted
web3js returns empty array on getPastEvents on polygon, optimism and arbitrum
@Ismael points out to change the provider and when I have changed the provider, the code works correctly.
- 51
1
vote
Where are layer 2 transactions (e.g. on Loopring Exchange) actually processed?
I'm not very familiar with Loopring specially, so let me give you a generic answer instead.
It's basically up to the L2 to decide and it can be anything. Most L2s start with centralized server(s) ...
- 30.2k
1
vote
Accepted
Transferring weth from my contract to an other wallet address on polygon without using bridges
It's not quite possible in solidity, but you can always use 3rd party centralized way of doing it
You can read event on the frontend whenever funds are transferred and then you can basically send ...
- 1,051
1
vote
Transferring weth from my contract to an other wallet address on polygon without using bridges
Each blockchain (Ethereum and Polygon for example) have their own storages, and cannot be accessed one with other. Its only possible to manage with 3rd party backends that could monitor both ...
- 346
1
vote
Does a Rollup transaction need the parameter 'nonce'?
The nonce is somehow "hidden" in the signature
Basically:
Signing: when you sign your transaction you sign it with a nonce.
Push to L1: the sequencer of the rollup checks if the nonce is ...
- 75
1
vote
Is Polygon (Matic) a layer-2 or a sidechain?
Sidechain is another blockchain that is connected to Ethereum by a two-way peg which allows users to transfer funds from the main chain to the sidechain and from the sidechain to the main chain. So ...
- 1,715
1
vote
Questions regarding Polygon Network Mapping
You need to deploy first on Ethereum, and then submit Token Mapping request or deploy it yourself ChildMintableERC721, this ChildMintableERC721 must be on Polygon's network based on their ...
- 2,441
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