StarkNet uses a similar scheme to calculate addresses for deployed contracts, most importantly it also has the option to use the deployer’s address for the new address.

victorforissier.eth

Another question I have is:

**What's easier, adapt the create2 trick in Solidity then transpile or transpile first then adapt in Cairo?**

---

### *From Newton AI:*

*"Create2" is a feature in Solidity, the programming language used to write smart contracts for the Ethereum blockchain. It allows the creation of new contract accounts using a deterministic algorithm, rather than having to send a transaction to create the contract like with the original "create" function. This can be useful in certain situations, such as when creating a contract that is intended to be deployed at a specific address.*

*Transpiling is the process of converting code written in one programming language into another language. This can be useful if a piece of code needs to be run on a platform that only supports a different language, or if it is desired to use a different language's features or syntax.*


Did you change the factory/create2 part (to compute pool addresses)?

Hello guys, does one know how to modify keccak.cairo and/or packed_keccak.cairo to compute a 512bits keccak hash instead of 256 bits?

I'm following a paper that needs 256 bits collision resistance so i need 512 bit keccak. 

There should only a few parameters to change but its quite hard to find them in the Cairo code 

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

---

This question is participating in [Newton Bounties | Incentivized Test Program](https://www.notion.so/Newton-Bounties-Incentivized-Test-Program-94322ad48e7d40a3adcf36f6b26174cd) Every verified valid question gets $10 USDC (mainnet)

How to modify keccak.cairo and/or packed_keccak.cairo to compute a 512bits keccak hash instead of 256 bits?


How large can addresses be in Cairo?


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/670)_

How large can addresses be in Cairo?

When calling `estimateFee`, I get a struct with `amount`, `unit`, `gas_price` and `gas_usage`. Wondering what is the difference between `amount` and `gas_usage` ?


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/967)_

Cairo: Difference between amount and gas_fee

Hello, Do I understand this correctly: Pathfinder JSON-RPC V0.1.0 does not support InvokeTXNV1 yet, right? At least, I do not `nonce` in `add_invoke_transaction`.

Do you plan to add it in JSON-RPC V0.1.0 like devnet (not being compliant to the spec) or will you introduce it with JSON-RPC V0.2.0?

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

Can anyone explain Pathfinder JSON-RPC InvokeTXNV1?

Hey guys,

I am having issue with generating _abi.json file when I use namespace,
Please see example below.

Does someone know solution of how to generate _abi.json file when namespace is used? I really need help 🙏 

This code generates starknet_abi.json

%lang starknet
from starkware.cairo.common.cairo_builtins import HashBuiltin
from starkware.starknet.common.syscalls import get_caller_address

@External
   func store_name{syscall_ptr: felt, pedersen_ptr: HashBuiltin, range_check_ptr}(_count: felt) -> (even : felt) {
      alloc_locals;
      local even;

      let (caller) = get_caller_address();
      if (_count == 2) {
         even = 1;
      }
      return (even=even);
   }
=============================================================
This code does not generates starknet_abi.json (please see use of  namespace)

%lang starknet
from starkware.cairo.common.cairo_builtins import HashBuiltin
from starkware.starknet.common.syscalls import get_caller_address

namespace ToMoon {
@External
   func store_name{syscall_ptr: felt, pedersen_ptr: HashBuiltin, range_check_ptr}(_count: felt) -> (even : felt) {
      alloc_locals;
      local even;

      let (caller) = get_caller_address();
      if (_count == 2) {
         even = 1;
      }
      return (even=even);
   }
}



Issue with generating _abi.json file 

I transferred USDC from Starknet to L1 via Starkgate.
In Starknet Explorer, it shows the assets received on L1, but I have no USDC received on L1. It’s been more than 12 hours. What could be the problem?!

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

Problem with transfering USDC via Starkgate. Can anyone help?

Hey guys, quick question. What should I use to execute abi.encodePacked from solidity in starknet?

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

Popular tags

Did you change the factory/create2 part (to compute pool addresses)?

From Newton AI:

1 answers

Your answer

Related

You may find useful