Mathieu

```[tasklist] ### Tasks - [ ] #1327 - [ ] #1346 - [ ] #1328 ```

Time spent on this PR: tbd ## Pull request type Please check the type of change your PR introduces: - [ ] Bugfix - [ ] Feature - [ ]...

design: anti-L1-spoofing messaging system

1

## Feature Request The current Messaging System takes the l1_sender address as the caller of the L2 contract invoked. This can be an issue if, for example, a L2 contract...

## Feature Request ### Describe the Feature Request When sending a message to L1, we use a solidity _call_, and the input data received in Cairo is an array of...

feat: add `get_code_hash` / `set_code_hash` entrypoints to the account class

2

## Feature Request see https://github.com/kkrt-labs/kakarot/blob/main/src/kakarot/accounts/library.cairo#L464 - Create the storage variable - Expose `get`/`set` accessors ### Describe the Feature Request ### Describe Preferred Solution ### Related Code ### Additional Context **If...

feat: support SNIP-9 on account contracts

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See https://github.com/kkrt-labs/kakarot/blob/7fb90d799a5a0bfab0a48bdfcb4e867d35b4943c/src/kakarot/accounts/account_contract.cairo#L83

## Feature Request see https://github.com/kkrt-labs/kakarot/blob/1beb37942077797000259249c7790607e8b28304/src/kakarot/accounts/library.cairo#L323 ### Describe the Feature Request ### Describe Preferred Solution ### Related Code ### Additional Context **If the feature request is approved, would you be willing...

- [x] #834 - [x] #846 - [x] #847 - [x] #852 - [x] #858

## Feature Request Implement the MCOPY opcode. KakarotZero implementation: https://github.com/kkrt-labs/kakarot/blob/b70fcf8b49fdad8ebb11e5e8db522e45e7e88508/src/kakarot/instructions/memory_operations.cairo#L89 ### Describe the Feature Request ### Describe Preferred Solution ### Related Code ### Additional Context **If the feature request is...

## Feature Request ### Describe the Feature Request - [x] #826 - [x] #827 - [x] #829 - [ ] #839 ### Describe Preferred Solution ### Related Code ### Additional...