I can't find info on what `vm_enter_scope` does within hints in the cairo-lang repo. Heres an example:
https://github.com/starkware-libs/cairo-lang/blob/d61255f32a7011e9014e1204471103c719cfd5cb/src/starkware/cairo/common/patricia.cairo#L117

Can anyone summarize?

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

Newton

I can't find info on what `vm_enter_scope` does within hints in the cairo-lang repo

How do I create OZ (Open Zeppelin) contract using starknetjs?

Does AA support "Session Keys" so I can avoid signing too many transactions when they are redundant?

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Does Account Abstraction support "Session Keys"?

Some questions that could be answered separately.

1. The only way to invoke a contract is using migrations (this applies for both devnet and testnet?)
2. When doing a migration file I receive the “Hint is not whitelisted. This may indicate that this library function cannot be used in StarkNet contracts.” error. For example for this code:

```
%lang starknet

@external
func up() {
    %{
        contract_address = deploy_contract(
             "./build/main.json",
             config={"wait_for_acceptance": True}
        ).contract_address

        invoke(
            contract_address,
            "initialize",
            {"new_authority": 123},
            config={
                "auto_estimate_fee": True,
                "wait_for_acceptance": True,
            }
        )
    %}

    return ();
}
```

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

The only way to invoke a contract is using migrations (this applies for both devnet and testnet?)

when i am planing to send a token ,it always goes wrong

how to send token 

Can tempvar be of a different type, say U256?

let's say

`tempvar foo: U256 = bar;` and bar being a U256?

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

Can tempvar be of a different type, say U256?

I have a question about how to print "Hello World" in Cairo 1. How do I log/print ?

How do I log/print in Cairo 1.0?

# I have a Solidity Smart contract like this:
```solidity
// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Storage
 * @dev Store & retrieve value in a variable
 */
contract Storage {

    uint256 number;

    /**
     * @dev Store value in variable
     * @param num value to store
     */
    function store(uint256 num) public {
        number = num;
    }

    /**
     * @dev Return value 
     * @return value of 'number'
     */
    function retrieve() public view returns (uint256){
        return number;
    }
}
``` 
## Which steps should I follow if I want to use kakarot?

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I can't find info on what `vm_enter_scope` does within hints in the cairo-lang repo

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