increase timestamp by +12 (on mainnet) instead of +1

Author: KillariDev

docs/ethsimulatev1-notes.md

@@ -15,7 +15,7 @@ Unlike `eth_call`, `eth_simulateV1`'s calls are conducted inside blocks. We don'
 | gasLimit | The same as the base block defined as the second parameter in the call |
 | hash | Calculated normally |
 | parentHash | Previous blocks hash |
-| timestamp | The timestamp of previous block + 1 |
+| timestamp | The timestamp of previous block + `network block time` (12s on mainnet) |
 | baseFeePerGas | When validation mode is true, baseFeePerGas is calculated on what it should be according to Ethereum's spec. When validation mode is false, the baseFeePerGas is set to zero |
 | sha3Uncles | Empty trie root |
 | withdrawals | Empty array |
@@ -30,8 +30,6 @@ Unlike `eth_call`, `eth_simulateV1`'s calls are conducted inside blocks. We don'
 | gasUsed | Calculated normally |
 | stateRoot | Calculated normally |
 
-An interesting note here is that we decide timestamp as `previous block timestamp + 1`, while `previous block timestamp + 12` could also be an assumed default. The reasoning to use `+1` is that it's the minimum amount we have to increase the timestamp to keep them valid. While `+12` is what Mainnet uses, there are other chains that use some other values, and we didn't want to complicate the specification to consider all networks.
-
 ## Default values for transactions
 As eth_simulate is an extension to `eth_call` we want to enable the nice user experience that the user does not need to provide all required values for a transaction. We are assuming following defaults if the variable is not provided by the user:
 | parameter name | description |

src/schemas/execute.yaml

@@ -225,7 +225,7 @@ EthSimulateBlockResultInvalid:
         - code: -38020
           message: Block number in sequence did not increase
         - code: -38021
-          message: Block timestamp in sequence did not increase
+          message: Block timestamp in sequence did not increase or stay the same
         - code: -38022
           message: MovePrecompileToAddress referenced itself in replacement
         - code: -38023