2.1.x/trustlessness

contracts/WitFeeds.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.7.0 <0.9.0;
+pragma solidity >=0.8.0 <0.9.0;
 
 import "./interfaces/IWitFeeds.sol";
 import "./interfaces/IWitFeedsEvents.sol";

contracts/WitOracle.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.7.0 <0.9.0;
+pragma solidity >=0.8.0 <0.9.0;
 
 import "./WitOracleRadonRegistry.sol";
 import "./WitOracleRequestFactory.sol";
@@ -16,4 +16,11 @@ abstract contract WitOracle
         IWitAppliance,
         IWitOracle,
         IWitOracleEvents
-{}
+{
+    function specs() virtual override external pure returns (bytes4) {
+        return (
+            type(IWitAppliance).interfaceId
+                ^ type(IWitOracle).interfaceId
+        );
+    }
+}

contracts/WitOracleRadonRegistry.sol

@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.7.0 <0.9.0;
-pragma experimental ABIEncoderV2;
+pragma solidity >=0.8.0 <0.9.0;
 
 import "./interfaces/IWitAppliance.sol";
 import "./interfaces/IWitOracleRadonRegistry.sol";
@@ -12,4 +11,11 @@ abstract contract WitOracleRadonRegistry
         IWitAppliance,
         IWitOracleRadonRegistry,
         IWitOracleRadonRegistryEvents
-{}
+{
+    function specs() virtual override external pure returns (bytes4) {
+        return (
+            type(IWitAppliance).interfaceId
+                ^ type(IWitOracleRadonRegistry).interfaceId
+        );
+    }
+}

contracts/WitOracleRequest.sol

@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.7.0 <0.9.0;
-pragma experimental ABIEncoderV2;
+pragma solidity >=0.8.0 <0.9.0;
 
 import "./interfaces/IWitOracleAppliance.sol";
 import "./interfaces/IWitOracleRequest.sol";

contracts/WitOracleRequestFactory.sol

@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.7.0 <0.9.0;
-pragma experimental ABIEncoderV2;
+pragma solidity >=0.8.0 <0.9.0;
 
 import "./interfaces/IWitOracleAppliance.sol";
 import "./interfaces/IWitOracleRadonRegistryEvents.sol";

contracts/WitOracleRequestTemplate.sol

@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.7.0 <0.9.0;
-pragma experimental ABIEncoderV2;
+pragma solidity >=0.8.0 <0.9.0;
 
 import "./interfaces/IWitOracleAppliance.sol";
 import "./interfaces/IWitOracleRadonRegistryEvents.sol";

contracts/WitPriceFeeds.sol

@@ -1,11 +1,11 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity >=0.7.0 <0.9.0;
+pragma solidity >=0.8.0 <0.9.0;
 
 import "./WitFeeds.sol";
 import "./interfaces/IWitPriceFeeds.sol";
 
-/// @title WitPriceFeeds: Price Feeds live repository reliant on the Witnet Oracle blockchain.
+/// @title WitPriceFeeds: Price Feeds live repository reliant on the Wit/oracle blockchain.
 /// @author The Witnet Foundation.
 abstract contract WitPriceFeeds
     is
@@ -18,4 +18,13 @@ abstract contract WitPriceFeeds
             "Price-"
         ) 
     {}
+
+    function specs() virtual override external pure returns (bytes4) {
+        return (
+            type(IWitOracleAppliance).interfaceId
+                ^ type(IERC2362).interfaceId
+                ^ type(IWitFeeds).interfaceId
+                ^ type(IWitPriceFeeds).interfaceId
+        );
+    }
 }

contracts/WitRandomness.sol

@@ -13,4 +13,11 @@ abstract contract WitRandomness
         IWitOracleEvents,
         IWitRandomness,
         IWitRandomnessEvents
-{}
+{
+    function specs() virtual override external pure returns (bytes4) {
+        return (
+            type(IWitOracleAppliance).interfaceId
+                ^ type(IWitRandomness).interfaceId
+        );
+    }
+}