feat: upgrade solidity version; feat: replace block.difficulty with p…

…revrandao
unchain-tech · Aug 6, 2023 · 74a6a53 · 74a6a53
1 parent 98b37db
commit 74a6a53
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Showing 2 changed files with 4 additions and 4 deletions.
diff --git a/packages/contract/contracts/WavePortal.sol b/packages/contract/contracts/WavePortal.sol
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 
-pragma solidity ^0.8.17;
+pragma solidity ^0.8.18;
 
 import 'hardhat/console.sol';
 
@@ -29,7 +29,7 @@ contract WavePortal {
     /*
      * 初期シードの設定
      */
-    _seed = (block.timestamp + block.difficulty) % 100;
+    _seed = (block.timestamp + block.prevrandao) % 100;
   }
 
   function wave(string memory _message) public {
@@ -49,7 +49,7 @@ contract WavePortal {
     /*
      *  ユーザーのために乱数を設定
      */
-    _seed = (block.difficulty + block.timestamp + _seed) % 100;
+    _seed = (block.prevrandao + block.timestamp + _seed) % 100;
 
     _waves.push(Wave(msg.sender, _message, block.timestamp, _seed));
 

diff --git a/packages/contract/hardhat.config.js b/packages/contract/hardhat.config.js
@@ -4,7 +4,7 @@ require('dotenv').config();
 const { PRIVATE_KEY, STAGING_ALCHEMY_KEY } = process.env;
 
 module.exports = {
-  solidity: '0.8.17',
+  solidity: '0.8.18',
   networks: {
     sepolia: {
       url: STAGING_ALCHEMY_KEY || '',