diff --git a/_data/chains/1.json b/_data/chains/1.json
index cb0bbb48..cf504990 100644
--- a/_data/chains/1.json
+++ b/_data/chains/1.json
@@ -15,5 +15,6 @@
   "infoURL": "https://ethereum.org",
   "shortName": "eth",
   "chainId": 1,
-  "networkId": 1
+  "networkId": 1,
+  "slip44": 60
 }
\ No newline at end of file
diff --git a/_data/chains/100.json b/_data/chains/100.json
index 07f656fb..ea7f9574 100644
--- a/_data/chains/100.json
+++ b/_data/chains/100.json
@@ -14,5 +14,6 @@
   "infoURL": "https://forum.poa.network/c/xdai-chain",
   "shortName": "xdai",
   "chainId": 100,
-  "networkId": 100
-}
\ No newline at end of file
+  "networkId": 100,
+  "slip44": 700
+}
diff --git a/_data/chains/101.json b/_data/chains/101.json
index 9f403b3a..ae18812f 100644
--- a/_data/chains/101.json
+++ b/_data/chains/101.json
@@ -14,5 +14,6 @@
   "infoURL": "https://einc.io",
   "shortName": "eti",
   "chainId": 101,
-  "networkId": 1
+  "networkId": 1,
+  "slip44": 464
 }
\ No newline at end of file
diff --git a/_data/chains/11.json b/_data/chains/11.json
index 8b7627c3..69f94b3e 100644
--- a/_data/chains/11.json
+++ b/_data/chains/11.json
@@ -14,5 +14,6 @@
   "infoURL": "https://metadium.com",
   "shortName": "meta",
   "chainId": 11,
-  "networkId": 11
+  "networkId": 11,
+  "slip44": 961
 }
\ No newline at end of file
diff --git a/_data/chains/1313114.json b/_data/chains/1313114.json
index 596ebee9..001999f8 100644
--- a/_data/chains/1313114.json
+++ b/_data/chains/1313114.json
@@ -14,5 +14,6 @@
   "infoURL": "https://ether1.org",
   "shortName": "etho",
   "chainId": 1313114,
-  "networkId": 1313114
+  "networkId": 1313114,
+  "slip44": 1313114
 }
\ No newline at end of file
diff --git a/_data/chains/1620.json b/_data/chains/1620.json
index 2d575149..4a752163 100644
--- a/_data/chains/1620.json
+++ b/_data/chains/1620.json
@@ -14,5 +14,6 @@
   "infoURL": "https://atheios.com",
   "shortName": "ath",
   "chainId": 1620,
-  "networkId": 11235813
+  "networkId": 11235813,
+  "slip44": 1620
 }
\ No newline at end of file
diff --git a/_data/chains/1987.json b/_data/chains/1987.json
index 4d0b5da8..417cd5e0 100644
--- a/_data/chains/1987.json
+++ b/_data/chains/1987.json
@@ -14,5 +14,6 @@
   "infoURL": "https://egem.io",
   "shortName": "egem",
   "chainId": 1987,
-  "networkId": 1987
+  "networkId": 1987,
+  "slip44": 1987
 }
\ No newline at end of file
diff --git a/_data/chains/2.json b/_data/chains/2.json
index 84197bc6..f50d9e2f 100644
--- a/_data/chains/2.json
+++ b/_data/chains/2.json
@@ -14,5 +14,6 @@
   "infoURL": "https://expanse.tech",
   "shortName": "exp",
   "chainId": 2,
-  "networkId": 1
+  "networkId": 1,
+  "slip44": 40
 }
\ No newline at end of file
diff --git a/_data/chains/61.json b/_data/chains/61.json
index 3da90515..88d0a2ba 100644
--- a/_data/chains/61.json
+++ b/_data/chains/61.json
@@ -14,5 +14,6 @@
   "infoURL": "https://ethereumclassic.org",
   "shortName": "etc",
   "chainId": 61,
-  "networkId": 1
+  "networkId": 1,
+  "slip44": 61
 }
\ No newline at end of file
diff --git a/_data/chains/61717561.json b/_data/chains/61717561.json
index 54967f15..d3f04865 100644
--- a/_data/chains/61717561.json
+++ b/_data/chains/61717561.json
@@ -17,5 +17,6 @@
   "infoURL": "https://aquachain.github.io",
   "shortName": "aqua",
   "chainId": 61717561,
-  "networkId": 61717561
+  "networkId": 61717561,
+  "slip44": 61717561
 }
\ No newline at end of file
diff --git a/src/main/kotlin/org/ethereum/lists/chains/ChainChecker.kt b/src/main/kotlin/org/ethereum/lists/chains/ChainChecker.kt
index 9339f6a8..24174b43 100644
--- a/src/main/kotlin/org/ethereum/lists/chains/ChainChecker.kt
+++ b/src/main/kotlin/org/ethereum/lists/chains/ChainChecker.kt
@@ -6,7 +6,7 @@ import org.kethereum.rpc.HttpEthereumRPC
 import java.io.File
 import java.math.BigInteger
 
-val all_fields = listOf(
+val mandatory_fields = listOf(
         "name",
         "shortName",
         "chain",
@@ -18,6 +18,9 @@ val all_fields = listOf(
         "infoURL",
         "nativeCurrency"
 )
+val optionalFields = listOf(
+        "slip44"
+)
 
 class FileNameMustMatchChainId : Exception("chainId must match the filename")
 class ExtensionMustBeJSON : Exception("filename extension must be json")
@@ -41,12 +44,12 @@ fun checkChain(it: File, connectRPC: Boolean) {
 
     getNumber(jsonObject, "networkId")
 
-    val extraFields = jsonObject.map.keys.subtract(all_fields)
+    val extraFields = jsonObject.map.keys.subtract(mandatory_fields).subtract(optionalFields)
     if (extraFields.isNotEmpty()) {
         throw ShouldHaveNoExtraFields(extraFields)
     }
 
-    val missingFields = all_fields.subtract(jsonObject.map.keys)
+    val missingFields = mandatory_fields.subtract(jsonObject.map.keys)
     if (missingFields.isNotEmpty()) {
         throw ShouldHaveNoMissingFields(missingFields)
     }