diff --git a/_data/chains/deprecated/eip155-1286.json b/_data/chains/eip155-1286.json
similarity index 63%
rename from _data/chains/deprecated/eip155-1286.json
rename to _data/chains/eip155-1286.json
index 3cc60c66..87c2353c 100644
--- a/_data/chains/deprecated/eip155-1286.json
+++ b/_data/chains/eip155-1286.json
@@ -1,5 +1,5 @@
 {
-  "name": "Moonrock",
+  "name": "Moonrock old",
   "chain": "MOON",
   "rpc": [],
   "faucets": [],
@@ -9,7 +9,8 @@
     "decimals": 18
   },
   "infoURL": "",
-  "shortName": "mrock",
+  "shortName": "mrock-old",
   "chainId": 1286,
-  "networkId": 1286
-}
\ No newline at end of file
+  "networkId": 1286,
+  "deprecated": true  
+}
diff --git a/_data/chains/deprecated/eip155-218.json b/_data/chains/eip155-218.json
similarity index 71%
rename from _data/chains/deprecated/eip155-218.json
rename to _data/chains/eip155-218.json
index 9cc2c382..fae3262a 100644
--- a/_data/chains/deprecated/eip155-218.json
+++ b/_data/chains/eip155-218.json
@@ -1,5 +1,5 @@
 {
-  "name": "SoterOne Mainnet",
+  "name": "SoterOne Mainnet old",
   "chain": "SOTER",
   "rpc": [
     "https://rpc.soter.one"
@@ -12,7 +12,8 @@
     "decimals": 18
   },
   "infoURL": "https://www.soterone.com",
-  "shortName": "SO1",
+  "shortName": "SO1-old",
   "chainId": 218,
-  "networkId": 218
+  "networkId": 218,
+  "deprecated": true  
 }
diff --git a/processor/src/main/kotlin/org/ethereum/lists/chains/Env.kt b/processor/src/main/kotlin/org/ethereum/lists/chains/Env.kt
index fbb13991..20ec2842 100644
--- a/processor/src/main/kotlin/org/ethereum/lists/chains/Env.kt
+++ b/processor/src/main/kotlin/org/ethereum/lists/chains/Env.kt
@@ -22,7 +22,8 @@ val optionalFields = listOf(
         "explorers",
         "title",
         "network",
-        "parent"
+        "parent",
+        "deprecated"
 )
 
 val moshi: Moshi = Moshi.Builder().build()
diff --git a/processor/src/main/kotlin/org/ethereum/lists/chains/Main.kt b/processor/src/main/kotlin/org/ethereum/lists/chains/Main.kt
index 05c30ca2..ace5915c 100644
--- a/processor/src/main/kotlin/org/ethereum/lists/chains/Main.kt
+++ b/processor/src/main/kotlin/org/ethereum/lists/chains/Main.kt
@@ -93,10 +93,8 @@ private fun doChecks(doRPCConnect: Boolean) {
         checkIcon(it)
     }
 
-    allFiles.filter { it.isDirectory }.forEach {
-        if (it.name != "deprecated") {
-            error("the only directory allowed is 'deprecated'")
-        }
+    allFiles.filter { it.isDirectory }.forEach { _ ->
+        error("should not contain a directory")
     }
 }
 
@@ -214,7 +212,11 @@ fun checkChain(chainFile: File, connectRPC: Boolean) {
             throw ENSRegistryAddressMustBeValid()
         }
     }
-
+    jsonObject["deprecated"]?.let {
+        if (it !is Boolean) {
+            throw DeprecatedMustBeBoolean()
+        }
+    }
     jsonObject["parent"]?.let {
         if (it !is JsonObject) {
             throw ParentMustBeObject()
diff --git a/processor/src/main/kotlin/org/ethereum/lists/chains/model/Exceptions.kt b/processor/src/main/kotlin/org/ethereum/lists/chains/model/Exceptions.kt
index 1f0830e1..522e9eb2 100644
--- a/processor/src/main/kotlin/org/ethereum/lists/chains/model/Exceptions.kt
+++ b/processor/src/main/kotlin/org/ethereum/lists/chains/model/Exceptions.kt
@@ -25,4 +25,5 @@ class ParentHasExtraFields(fields: Set<String>): Exception("parent has extra fie
 class ParentBridgeNoArray: Exception("parent bridge must be array")
 class BridgeNoObject: Exception("parent bridges must be array consisting of json objects")
 class BridgeOnlyURL: Exception("parent bridge only contain an URL")
-class ParentChainDoesNotExist(chain: String): Exception("Referenced parent chain ($chain) does not exist")
\ No newline at end of file
+class ParentChainDoesNotExist(chain: String): Exception("Referenced parent chain ($chain) does not exist")
+class DeprecatedMustBeBoolean: Exception("deprecated must be boolean")
\ No newline at end of file
diff --git a/processor/src/test/kotlin/org/ethereum/lists/chains/TheChainChecker.kt b/processor/src/test/kotlin/org/ethereum/lists/chains/TheChainChecker.kt
index 327d8eb4..17d213a2 100644
--- a/processor/src/test/kotlin/org/ethereum/lists/chains/TheChainChecker.kt
+++ b/processor/src/test/kotlin/org/ethereum/lists/chains/TheChainChecker.kt
@@ -221,6 +221,11 @@ class TheChainChecker {
         checkChain(getFile("invalid/explorermissingurl/eip155-1.json"), false)
     }
 
+    @Test(expected = DeprecatedMustBeBoolean::class)
+    fun shouldFailOnInvalidDeprecation() {
+        checkChain(getFile("invalid/invalid_deprecation/eip155-1.json"), false)
+    }
+
     @Test
     fun canParse2chains() {
         checkChain(getFile("valid/eip155-1.json"), false)
diff --git a/processor/src/test/resources/test_chains/invalid/invalid_deprecation/eip155-1.json b/processor/src/test/resources/test_chains/invalid/invalid_deprecation/eip155-1.json
new file mode 100644
index 00000000..11a8782e
--- /dev/null
+++ b/processor/src/test/resources/test_chains/invalid/invalid_deprecation/eip155-1.json
@@ -0,0 +1,21 @@
+{
+  "name": "Ethereum Mainnet",
+  "shortName": "eth",
+  "chain": "ETH",
+  "network": "mainnet",
+  "chainId": 1,
+  "networkId": 1,
+  "rpc": [
+    "https://mainnet.infura.io/v3/${INFURA_API_KEY}",
+    "https://api.mycryptoapi.com/eth"
+  ],
+  "faucets": [],
+  "infoURL": "https://ethereum.org",
+  "nativeCurrency": {
+    "name": "Ether",
+    "symbol": "ETH",
+    "decimals": 18
+  },
+  "explorers": [],
+  "deprecated": "yolo"
+}
\ No newline at end of file
diff --git a/processor/src/test/resources/test_chains/valid/eip155-1.json b/processor/src/test/resources/test_chains/valid/eip155-1.json
index 457f8964..847e295f 100644
--- a/processor/src/test/resources/test_chains/valid/eip155-1.json
+++ b/processor/src/test/resources/test_chains/valid/eip155-1.json
@@ -15,5 +15,6 @@
     "name": "Ether",
     "symbol": "ETH",
     "decimals": 18
-  }
+  },
+  "deprecated": true
 }