First, decide the StarkNet network you wish to run on. You will need access to a trusted Ethereum full node that matches the StarkNet network:

Ethereum mainnet for StarkNet mainnet,
or Goerli Ethereum for StarkNet testnet.
The easiest way is to setup an account with an Ethereum node service such as Alchemy or Infura. Once you have an account setup, take note of the Ethereum RPC url for the network you need.

You can then start a pathfinder node by following their docker guide: https://github.com/eqlabs/pathfinder#running-with-docker



How do I run a Pathfinder node?

Why abi of warp compiled contract does not match original solidity abi?

Why am I having trouble deploying my Cairo contract?

I’m having a problem where I’m trying to use a Uint256 in a hint, but I keep getting this error


Here is my code:


`%builtins output range_check`


`﻿`


`from starkware.cairo.common.uint256 import (uint256_add, Uint256,`


 `uint256_mul)`


`from starkware.cairo.common.serialize import serialize_word`


`﻿`


`func main{output_ptr : felt*, range_check_ptr}():`


 `alloc_locals`


 `let num1 = Uint256(20000, 0)`


 `%{print(ids.num1)%}`


 `let num2 = Uint256(low=0,high=7)`


 `let (local mul_low : Uint256, local mul_high : Uint256) = uint256_mul(num1, num2)`


 `serialize_word(mul_high.low)`


`﻿`


 `return ()`


`end`


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/378)_

Cairo error "Expected expression of type 'starkware.cairo.common.uint256.Uint256' to have an address."

Can anyone share some articles explaining SNARK/STARK concepts and rollups (Optimism)?

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Can anyone share some articles explaining SNARK/STARK concepts and rollups (Optimism)?

Does AA work on Mobile?

---

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Does Account Abstraction work on Mobile?

I am looking for n % 2 = 0 operation


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/594)_

How do you check if a number is even in Cairo?

### *From Newton AI*
*"Assembly" is a low-level language that is used to write smart contracts for the Ethereum Virtual Machine (EVM). It is similar to machine code, which is the code that is run directly on a computer's central processing unit (CPU). Assembly is often used in Solidity contracts to perform complex tasks or to optimize the performance of the contract.*

*If a Solidity contract contains assembly code, it is important to be careful when working with it, as it can be difficult to read and understand. Additionally, certain assembly instructions, known as "special EVM calls," can have unintended consequences if not used correctly. For example, some special EVM calls can cause a contract to consume an excessive amount of gas, which can make it more expensive for users to interact with the contract.*

*It is generally recommended to avoid using assembly in Solidity contracts if possible, as it can make the contract more difficult to understand and maintain. If you do need to use assembly, it is important to thoroughly test and debug the contract to ensure that it functions as intended.*

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How do I run a Pathfinder node?

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