3607: updated pseudocode, added diff (#3614)

* 3607: updated pseudocode, added diff

* small change to test bot

* undo previous change

Co-authored-by: Alita Moore <alita.moore805@gmail.com>

EIPS/eip-3607.md

@@ -74,14 +74,15 @@ A set of test cases can be found [here](https://github.com/ethereum/tests/pull/8
 ## Reference Implementation
 
 The following check must be added to the state transition checks after checking that the nonce of the sender is correct.
-```go
+```
 // Make sure the sender is an EOA
-if codesize := st.state.GetCodeSize(st.msg.From()); codesize != 0 {
+Set cs to the CodeSize of the sender account
+if cs is not 0 then
 	return ErrSenderNoEOA
-}
+end if
 ```
 
-An implementation in go-ethereum can be found [here](https://github.com/ethereum/go-ethereum/pull/23002)
+An diff to implement EIP-3607 in go-ethereum can be found [here](../assets/eip-3607/geth.diff)
 
 ## Security Considerations
 

assets/eip-3607/geth.diff

@@ -0,0 +1,16 @@
+diff --git a/core/state_transition.go b/core/state_transition.go
+index 18777d8d4..3b25155c6 100644
+--- a/core/state_transition.go
++++ b/core/state_transition.go
+@@ -219,6 +219,11 @@ func (st *StateTransition) preCheck() error {
+                                st.msg.From().Hex(), msgNonce, stNonce)
+                }
+        }
++       // Make sure the sender is an EOA
++       if codesize := st.state.GetCodeSize(st.msg.From()); codesize != 0 {
++               return fmt.Errorf("%w: address %v, codesize: %d", ErrSenderNoEOA,
++                       st.msg.From().Hex(), codesize)
++       }
+        // Make sure that transaction feeCap is greater than the baseFee (post london)
+        if st.evm.ChainConfig().IsLondon(st.evm.Context.BlockNumber) {
+                if l := st.feeCap.BitLen(); l > 256 {