chore: upgrade testnets to v0.7.9

contracts/impls/apps/WitnetPriceFeedsUpgradable.sol

@@ -337,9 +337,9 @@ contract WitnetPriceFeedsUpgradable
                     }
                     __feed.latestValidQueryId = _latestId;
                 } else {
-                    // Otherwise, delete latest query, as it was faulty
+                    // Otherwise, try to delete latest query, as it was faulty
                     // and we are about to post a new update request:
-                    witnet.deleteQuery(_latestId);
+                    try witnet.deleteQuery(_latestId) {} catch {}
                 }
                 // Post update request to the WRB:
                 _latestId = witnet.postRequest{value: _usedFunds}(__feed.radHash, _slaHash);

contracts/impls/core/WitnetBytecodesDefault.sol

@@ -575,7 +575,7 @@ contract WitnetBytecodesDefault
             }
 
             // Calculate radhash and add request metadata and rad bytecode to storage:
-            _radHash = _bytecode.hash();
+            _radHash = _witnetHash(_bytecode);
             __database().rads[hash] = _radHash;
             __database().radsBytecode[_radHash] = _bytecode;
             __database().requests[_radHash] = RadonRequest({
@@ -603,7 +603,7 @@ contract WitnetBytecodesDefault
         bytes memory _bytecode = _sla.encode();
 
         // Calculate hash and add to storage if new:
-        _slaHash = _bytecode.hash();
+        _slaHash = _witnetHash(_bytecode);
         if (__database().slas[_slaHash].numWitnesses == 0) {
             __database().slas[_slaHash] = _sla;
             __database().slasBytecode[_slaHash] = _bytecode;
@@ -660,4 +660,8 @@ contract WitnetBytecodesDefault
         }
     }
 
+    function _witnetHash(bytes memory chunk) virtual internal pure returns (bytes32) {
+        return sha256(chunk);
+    }
+
 }

contracts/impls/core/customs/WitnetBytecodesNoSha256.sol

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity >=0.7.0 <0.9.0;
+pragma experimental ABIEncoderV2;
+
+import "../WitnetBytecodesDefault.sol";
+
+contract WitnetBytecodesNoSha256 is WitnetBytecodesDefault {
+
+    constructor(
+            bool _upgradable,
+            bytes32 _versionTag
+        )
+        WitnetBytecodesDefault(_upgradable, _versionTag)
+    {}
+
+    function _witnetHash(bytes memory chunk) virtual override internal pure returns (bytes32) {
+        return keccak256(chunk);
+    }
+}

contracts/impls/core/customs/WitnetRequestFactoryCfxCore.sol

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity >=0.7.0 <0.9.0;
+pragma experimental ABIEncoderV2;
+
+import "../WitnetRequestFactoryDefault.sol";
+
+contract WitnetRequestFactoryCfxCore is WitnetRequestFactoryDefault {
+    constructor(
+            WitnetBytecodes _registry,
+            bool _upgradable,
+            bytes32 _versionTag
+        )
+        WitnetRequestFactoryDefault(_registry, _upgradable, _versionTag)
+    {}
+
+    function _cloneDeterministic(bytes32 _salt)
+        override internal
+        returns (address _instance)
+    {
+        bytes memory ptr = _cloneBytecodePtr();
+        assembly {
+            // CREATE2 new instance:
+            _instance := create2(0, ptr, 0x37, _salt)
+        }
+        emit Cloned(msg.sender, self(), _instance);
+    }
+}

contracts/libs/Witnet.sol

@@ -355,7 +355,7 @@ library Witnet {
         ) {
             return sha256(_bytecode);
         } else {
-            return 0x0;
+            return keccak256(_bytecode);
         }
     }
 

contracts/patterns/Clonable.sol

@@ -97,7 +97,7 @@ abstract contract Clonable
     /// @dev See https://eips.ethereum.org/EIPS/eip-1167.
     /// @dev See https://blog.openzeppelin.com/deep-dive-into-the-minimal-proxy-contract/.
     function _cloneDeterministic(bytes32 _salt)
-        internal
+        virtual internal
         returns (address _instance)
     {
         bytes memory ptr = _cloneBytecodePtr();

migrations/witnet.settings.js

@@ -10,12 +10,21 @@
     boba: {
       WitnetRequestBoard: "WitnetRequestBoardTrustableOvm2",
     },
+    conflux: {
+      WitnetRequestFactory: "WitnetRequestFactoryCfxCore",
+    },
     optimism: {
       WitnetRequestBoard: "WitnetRequestBoardTrustableOvm2",
     },
+    "polygon.zkevm.goerli": {
+      WitnetBytecodes: "WitnetBytecodesNoSha256",
+    },
     reef: {
       WitnetRequestBoard: "WitnetRequestBoardTrustableReef",
     },
+    scroll: {
+      WitnetBytecodes: "WitnetBytecodesNoSha256",
+    }
   },
   compilers: {
     default: {
@@ -29,11 +38,6 @@
         },
       },
     },
-    conflux: {
-      solc: {
-        evmVersion: "petersburg",
-      },
-    },
   },
   constructorParams: {
     default: {
@@ -134,6 +138,10 @@
         host: "localhost",
         port: 8545,
         skipDryRun: true,
+        verify: {
+          apiUrl: "https://api-goerli.etherscan.io/",
+          browserURL: "https://goerli.etherscan.io/",
+        },
       },
       "ethereum.kovan": {
         network_id: 42,
@@ -165,6 +173,10 @@
         host: "localhost",
         port: 8517,
         skipDryRun: true,
+        verify: {
+          apiUrl: "https://api-goerli.arbiscan.io/",
+          browserURL: "https://goerli.arbiscan.io/",
+        },
       },
       "arbitrum.one": {
         network_id: 42161,
@@ -173,7 +185,7 @@
         skipDryRun: true,
         verify: {
           apiUrl: "https://api.arbiscan.io/api",
-          browserURL: "https://arbiscan.io/address",
+          browserURL: "https://arbiscan.io/",
         },
       },
     },
@@ -191,6 +203,11 @@
         port: 8533,
         skipDryRun: true,
         gasPrice: 30 * 10 ** 9,
+        verify: {
+          apiKey: "MY_API_KEY",
+          apiUrl: "https://api-testnet.snowtrace.io/",
+          browserURL: "https://testnet.snowtrace.io/",
+        },
       },
     },
     boba: {
@@ -216,29 +233,21 @@
           apiKey: "MY_API_KEY",
         },
       },
-      "boba.moonbeam.bobabase": {
-        network_id: 1297,
-        host: "localhost",
-        port: 8518,
-        skipDryRun: true,
-      },
       "boba.ethereum.mainnet": {
         network_id: 288,
         host: "localhost",
         port: 9539,
         skipDryRun: true,
       },
-      "boba.ethereum.rinkeby": {
-        network_id: 28,
-        host: "localhost",
-        port: 8539,
-        skipDryRun: true,
-      },
       "boba.ethereum.goerli": {
         network_id: 2888,
         host: "localhost",
         port: 8515,
         skipDryRun: true,
+        verify: {
+          apiUrl: "https://api-testnet.bobascan.com/api",
+          browserURL: "https://testnet.bobascan.com/",
+        },
       },
     },
     celo: {
@@ -247,6 +256,11 @@
         host: "localhost",
         port: 8538,
         skipDryRun: true,
+        verify: {
+          apiKey: "MY_API_KEY",
+          apiUrl: "https://explorer.celo.org/alfajores/api",
+          browserURL: "https://explorer.celo.org/alfajores/",
+        },
       },
       "celo.mainnet": {
         network_id: 42220,
@@ -293,6 +307,10 @@
         port: 8530,
         network_id: 338,
         skipDryRun: true,
+        verify: {
+          apiUrl: "https://cronos.org/explorer/testnet3/api",
+          browserURL: "https://cronos.org/explorer/testnet3",
+        },
       },
       "cronos.mainnet": {
         host: "localhost",
@@ -323,6 +341,12 @@
         port: 8519,
         network_id: 568,
         skipDryRun: true,
+        gas: 6000000,
+        verify: {
+          apiKey: "MY_API_KEY",
+          apiUrl: "http://explorer-testnet.dogechain.dog/api",
+          browserURL: "https://explorer-testnet.dogechain.dog/",
+        },
       },
       "dogechain.mainnet": {
         host: "localhost",
@@ -338,6 +362,7 @@
         network_id: 21,
         skipDryRun: true,
         verify: {
+          apiKey: "MY_API_KEY",
           apiUrl: "https://esc-testnet.elastos.io/api",
           browserURL: "https://esc-testnet.elastos.io/address",
         },
@@ -407,6 +432,11 @@
         port: 8526,
         network_id: 2221,
         skipDryRun: true,
+        verify: {
+          apiKey: "MY_API_KEY",
+          apiUrl: "https://explorer.testnet.kava.io/api",
+          browserURL: "https://explorer.testnet.kava.io/",
+        },
       },
       "kava.mainnet": {
         host: "localhost",
@@ -422,6 +452,11 @@
         network_id: 322,
         gasPrice: 10 ** 10,
         skipDryRun: true,
+        verify: {
+          apiKey: "MY_API_KEY",
+          apiUrl: "https://scan-testnet.kcc.network/api",
+          browserURL: "https://scan-testnet.kcc.network/",
+        },
       },
       "kcc.mainnet": {
         host: "localhost",
@@ -462,7 +497,7 @@
         verify: {
           apiKey: "MY_API_KEY",
           apiUrl: "https://goerli.explorer.metisdevops.link/api",
-          explorerUrl: "https://goerli.explorer.metisdevops.link//address",
+          explorerUrl: "https://goerli.explorer.metisdevops.link/address",
         },
       },
     },
@@ -521,6 +556,11 @@
         port: 8520,
         network_id: 420,
         skipDryRun: true,
+        verify: {
+          apiKey: "MY_API_KEY",
+          apiUrl: "https://optimism-goerli.blockscout.com/api",
+          explorerUrl: "https://optimism-goerli.blockscout.com/",
+        },
       },
       "optimism.mainnet": {
         host: "localhost",
@@ -548,7 +588,7 @@
         network_id: 1442,
         skipDryRun: true,
         verify: {
-          apiUrl: "http://api-testnet-zkevm.polygonscan.com/api",
+          apiUrl: "https://api-testnet-zkevm.polygonscan.com/api",
           explorerUrl: "https://testnet-zkevm.polygonscan.com/address",
         },
       },
@@ -575,9 +615,9 @@
         skipDryRun: true,
         gasPrice: 3000000,
         verify: {
+          apiKey: "abc",
           apiUrl: "https://blockscout.scroll.io/api",
-          apiKey: "MY_API_KEY",
-          explorerUrl: "https://blockscout.scroll.io/address",
+          explorerUrl: "https://blockscout.scroll.io/",
         },
       },
     },

truffle-config.js

@@ -39,6 +39,8 @@ module.exports = {
   ],
   api_keys: {
     arbiscan: process.env.ARBISCAN_API_KEY,
+    bobascan: process.env.BOBASCAN_API_KEY,
+    cronos: process.env.CRONOSCAN_API_KEY,
     etherscan: process.env.ETHERSCAN_API_KEY,
     moonscan: process.env.MOONSCAN_API_KEY,
     polygonscan: process.env.POLYGONSCAN_API_KEY,