In design, are system contracts addresses able to be payable?

[yangby-cryptape]

Question

In other words, could I send tokens to a system contract address?

[KaoImin]

Currently, you can do this. However, it is a waste of tokens.

[yangby-cryptape]

Currently, you can do this. However, it is a waste of tokens.

But when I do transfer in MetaMask, it returns "Invalid system script transaction".

So, can you confirm what you said above?

[KaoImin]

Currently, you can do this. However, it is a waste of tokens.

But when I do transfer in MetaMask, it returns "Invalid system script transaction".

So, can you confirm what you said above?

Sorry, I forget the call system contract inspection:

axon/core/mempool/src/adapter/mod.rs

Lines 182 to 200 in e64f03c

	async fn check_system_script_tx_authorization(
	&self,
	ctx: Context,
	stx: &SignedTransaction,
	) -> ProtocolResult<U256> {
	let addr = &stx.sender;
	let block = self.storage.get_latest_block(ctx.clone()).await?;
	let root = self.executor_backend(ctx).await?.get_metadata_root();
	if MetadataHandle::new(root).is_validator(block.header.number + 1, *addr)? {
	return Ok(U256::zero());
	}
	Err(MemPoolError::CheckAuthorization {
	tx_hash: stx.transaction.hash,
	err_info: "Invalid system script transaction".to_string(),
	}
	.into())
	}

Nobody can send tokens to a system contract address because if the transaction calls a system contract address, executor will not execute it in EVM.

axon/core/executor/src/system_contract/mod.rs

Lines 204 to 223 in e64f03c

	pub fn system_contract_dispatch<Adapter: ExecutorAdapter + ApplyBackend>(
	adapter: &mut Adapter,
	tx: &SignedTransaction,
	) -> Option<TxResp> {
	if let Some(addr) = tx.get_to() {
	log::debug!("execute addr {:}", addr);
	if addr == NATIVE_TOKEN_CONTRACT_ADDRESS {
	return Some(NativeTokenContract::default().exec_(adapter, tx));
	} else if addr == METADATA_CONTRACT_ADDRESS {
	return Some(MetadataContract::default().exec_(adapter, tx));
	} else if addr == CKB_LIGHT_CLIENT_CONTRACT_ADDRESS {
	return Some(CkbLightClientContract::default().exec_(adapter, tx));
	} else if addr == IMAGE_CELL_CONTRACT_ADDRESS {
	return Some(ImageCellContract::default().exec_(adapter, tx));
	}
	}
	None
	}

[yangby-cryptape]

Nobody can send tokens to a system contract address ...

Please check the Metadata contract address in the Axon internal testnet.

Its balance is 1,539.471495196523525479 ETH.

I forget the call system contract inspection ...

The inspection could be bypassed.

---

How to reproduce?

• send

---

I have checked the latest commit 8a0e1a9. I think I have got the same result.

[KaoImin]

@driftluo please check why the transfer process of system contract transactions can be executed. The system contract does not execute in EVM and change the balance.

[yangby-cryptape]

@driftluo please check why the transfer process of system contract transactions can be executed. The system contract does not execute in EVM and change the balance.

Because the rust code won't be called in the EVM executor.

The executor will fetch the data of that address and execute the data as code.