From 1efdb7419c55e39daf1c3725b0a13431b4ff2374 Mon Sep 17 00:00:00 2001
From: yann300 <yann.levreau@gmail.com>
Date: Wed, 6 Dec 2017 15:04:44 +0100
Subject: [PATCH] check for genesishash if network id is 1

---
 src/execution-context.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/execution-context.js b/src/execution-context.js
index ff134f302c..77c2ea86d0 100644
--- a/src/execution-context.js
+++ b/src/execution-context.js
@@ -74,6 +74,8 @@ vm.stateManager.checkpoint()
 var web3VM = new Web3VMProvider()
 web3VM.setVM(vm)
 
+var mainNetGenesisHash = '0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3'
+
 /*
   trigger contextChanged, web3EndpointChanged
 */
@@ -108,6 +110,14 @@ function ExecutionContext () {
         else if (id === '4') name = 'Rinkeby'
         else if (id === '42') name = 'Kovan'
         else name = 'Custom'
+
+        if (id === '1') {
+          this.web3().eth.getBlock(0, (error, block) => {
+            if (error) console.log('cant query first block')
+            if (block && block.hash !== mainNetGenesisHash) name = 'Custom'
+            callback(err, { id, name })
+          })
+        }
         callback(err, { id, name })
       })
     }