分类 Ethereum-新手教程 下的文章

Ethereum-新手教程

How to check if Ethereum address is valid or not

web3.js

const address = "0x0089d53F703f7E0843953D48133f74cE247184c2"
let result = Web3.utils.isAddress(address)
console.log(result)  // => true

web3j

社区fork为其增加了isAddress commit
https://github.com/bcskill/web3j

package org.web3j.utils;

import org.junit.Test;

import static junit.framework.TestCase.assertFalse;
import static org.junit.Assert.assertTrue;

import static org.web3j.utils.Account.isAddress;

public class AccountTest {
    @Test
    public void verifyIsAddress() {
        String validLowerCaseAddress = "0x3de8c14c8e7a956f5cc4d82beff749ee65fdc358";
        assertTrue(isAddress(validLowerCaseAddress));
        String validChecksumAddress = "0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359";
        assertTrue(isAddress(validChecksumAddress));
        String invalidLengthAddress = "0x3de8c14c8e7a956f5cc4d82beff749ee65bac35";
        assertFalse(isAddress(invalidLengthAddress));
        String invalidChecksumAddress = "0x3de8c14c8E7a956f5cc4d82beff749ee65fdc358";
        assertFalse(isAddress(invalidChecksumAddress));
    }
}

参考

https://piyopiyo.medium.com/how-to-check-if-ethereum-address-is-valid-or-not-ef587b6c4819
https://github.com/assafY/web3j.git

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2021-07-21 0 条评论
Ethereum-新手教程

从哪里获得xDai代币

由于Swarn正式线基于xDai以太坊侧链运行，因为启动需要部署支票合约，所以需要拥有一定量的xDai

此片文章只讨论Swarm技术问题，社区不推荐任何虚拟币购买和交易

直接兑换

https://bitmax.io/en/basic/cashtrade-spottrading/usdt/xdai

跨链过去DAI->XDAI

可以直接GM DAI https://www.huobi.com/en-us/exchange/dai_usdt/ 然后 直接跨链过去 https://bridge.xdaichain.com/

添加到MetaMask

网络名称：xDai
新的RPC网址：https://rpc.xdaichain.com/
链 ID：0x64
符号：xDai
区块浏览器网址：https://blockscout.com/xdai/mainnet
https://www.xdaichain.com/for-users/wallets/metamask/metamask-setup#setting-up-metamask-for-xdai

参考文档

https://www.xdaichain.com/for-users/get-xdai-tokens#how-to-get-xdai-stable-tokens

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2021-06-21 0 条评论