您正在查看: Surou 发布的文章

chrome清除缓存、不使用缓存而刷新快捷键

2020-07-01　 Surou　阅读　 Other-经验分享　 0 评论

Ctrl+Shift+Del 清除Google浏览器缓存的快捷键
Ctrl+Shift+R 重新加载当前网页而不使用缓存内容
Ctrl + F5 去除缓存+刷新快捷键

Cosmos钱包管理和离线交易签名工具

2020-07-01　 Surou　阅读　 Cross chain-优秀转载　 0 评论

github: https://github.com/hukkinj1/cosmospy

cosmospy

Version 5.0.1

Tools for Cosmos wallet management and offline transaction signing

Installing

Installing from PyPI repository (https://pypi.org/project/cosmospy):

pip install cosmospy

Usage

Generating a wallet

from cosmospy import generate_wallet
wallet = generate_wallet()

The value assigned to wallet will be a dictionary just like:

{
    "seed": "arch skill acquire abuse frown reject front second album pizza hill slogan guess random wonder benefit industry custom green ill moral daring glow elevator",
    "derivation_path": "m/44'/118'/0'/0/0",
    "private_key": b"\xbb\xec^\xf6\xdcg\xe6\xb5\x89\xed\x8cG\x05\x03\xdf0:\xc9\x8b \x85\x8a\x14\x12\xd7\xa6a\x01\xcd\xf8\x88\x93",
    "public_key": b"\x03h\x1d\xae\xa7\x9eO\x8e\xc5\xff\xa3sAw\xe6\xdd\xc9\xb8b\x06\x0eo\xc5a%z\xe3\xff\x1e\xd2\x8e5\xe7",
    "address": "cosmos1uuhna3psjqfxnw4msrfzsr0g08yuyfxeht0qfh",
}

Converter functions

Mnemonic seed to private key

from cosmospy import seed_to_privkey
seed = "teach there dream chase fatigue abandon lava super senior artefact close upgrade"
privkey = seed_to_privkey(seed, path="m/44'/118'/0'/0/0")

Private key to public key

from cosmospy import privkey_to_pubkey
privkey = bytes.fromhex("6dcd05d7ac71e09d3cf7da666709ebd59362486ff9e99db0e8bc663570515afa")
pubkey = privkey_to_pubkey(privkey)

Public key to address

from cosmospy import pubkey_to_address
pubkey = bytes.fromhex("03e8005aad74da5a053602f86e3151d4f3214937863a11299c960c28d3609c4775")
addr = pubkey_to_address(pubkey)

Private key to address

from cosmospy import privkey_to_address
privkey = bytes.fromhex("6dcd05d7ac71e09d3cf7da666709ebd59362486ff9e99db0e8bc663570515afa")
addr = privkey_to_address(privkey)

Signing transactions

from cosmospy import Transaction
tx = Transaction(
    privkey=bytes.fromhex("26d167d549a4b2b66f766b0d3f2bdbe1cd92708818c338ff453abde316a2bd59"),
    account_num=11335,
    sequence=0,
    fee=1000,
    gas=70000,
    memo="",
    chain_id="cosmoshub-3",
    sync_mode="sync",
)
tx.add_transfer(recipient="cosmos103l758ps7403sd9c0y8j6hrfw4xyl70j4mmwkf", amount=387000)
tx.add_transfer(recipient="cosmos1lzumfk6xvwf9k9rk72mqtztv867xyem393um48", amount=123)
pushable_tx = tx.get_pushable()

One or more token transfers can be added to a transaction by calling the add_transfer method.

When the transaction is fully prepared, calling get_pushable will return a signed transaction in the form of a JSON string. This can be used as request body when calling the POST /txs endpoint of the Cosmos REST API.

让区块链浏览器收录你的 ERC20 代币

2020-07-01　 Surou　阅读　 Ethereum-优秀转载　 0 评论

如果想让其他浏览器显示新发的代币，需要主动提交代币信息，对方审核通过后，即可显示。

打开网址https://etherscan.io，在此处输入 token 的智能合约地址，如下图：

搜索后，如下图：

按下图指示，点击“verify and publish”来发布代码，

由于读者已经发布了代码，这里就找了几张图贴出来，以供参考。

步骤一：

步骤二：

步骤三：

若出现如下图，即表示收录成功。

转载：https://my.oschina.net/u/3050295/blog/1982504

Eosplayer -> eosjs的绑定层

2020-06-28　 Surou　阅读　 EOS-开源推荐　 0 评论

Eosplayer是eosjs的绑定层，它基于eosjs并为应用程序层提供了更好的可用性。它既可以在node.js服务器上使用，也可以在已经安装了Scatter的浏览器或Dapp钱包中使用。

frontd releases : https://github.com/bagaking/eosplayer/releases

演示地址：http://eosplayer.kihand.com/#/

Web3j send ERC20 Token Demo

2020-06-28　 Surou　阅读　 Ethereum-优秀转载　 0 评论

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <script src="../../libs/web3.js_v1.0.0-beta.35/web3.min.js"></script>
</head>
<body>

  <h1>Send ERC20 Token</h1>

  <h2>Notes</h2>
  <ul>
    <li>Use MetaMask</li>
    <li>To check ERC20 balance, use <a href="../getERC20TokenBalance/" target="_blank">getERC20TokenBalance</a></li>
  </ul>

  <h2>Token Address</h2>
  <input type="text" id="token-address" size="80" oninput="onAddressChange()"></input>
  <p>e.g. 0x2A65D41dbC6E8925bD9253abfAdaFab98eA53E34</p>

  <h2>Recipients Address</h2>
  <input type="text" id="to-address" size="80"></input>
  <p>e.g. 0x8Df70546681657D6FFE227aB51662e5b6e831B7A</p>

  <h2>Decimals</h2>
  <input type="number" id="decimals" size="40" readonly></input>

  <h2>Amount</h2>
  <input type="number" id="amount" size="40"></input>

  <div><button id="send" onclick="send()">Send ERC20 Token</button></div>

  <h2>Result</h2>
  <span id="result"></span>

  <script>

    var web3js;
    var account;

    function getERC20TokenBalance(tokenAddress, walletAddress, callback) {
      let minABI = [
        {"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"type":"function"},
        {"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"type":"function"}
      ];
      let contract = new web3js.eth.Contract(minABI, tokenAddress);
      contract.methods.balanceOf(walletAddress).call((error, balance) => {
        contract.methods.decimals().call((error, decimals) => {
          console.log(balance);
          console.log(decimals);
          balance = balance / (10**decimals);
          callback(balance);
        });
      });
    }

    function getERC20TokenContract(tokenAddress) {
      let minABI = [
        {"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"type":"function"},
        {"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"type":"function"},
        {"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"type":"function"}
      ];
      return new web3js.eth.Contract(minABI, tokenAddress);
    }

    function getERC20TokenDecimals(callback) {
      window.tokenContract.methods.decimals().call((error, decimals) => {
        callback(decimals);
      });
    }

    function onAddressChange(e) {
      let tokenAddress = document.getElementById('token-address').value;
      if(tokenAddress != "") {
        window.tokenContract = getERC20TokenContract(tokenAddress);
        getERC20TokenDecimals((decimals) => {
          document.getElementById('decimals').value = decimals;
        });
      }
    }

    function transferERC20Token(toAddress, value, callback) {
      window.tokenContract.methods.transfer(toAddress, value).send({from: account})
      .on('transactionHash', function(hash){
        callback(hash);
      });
    }

    function send() {
      var toAddress = document.getElementById('to-address').value;
      var decimals = web3js.utils.toBN(document.getElementById('decimals').value);
      var amount = web3js.utils.toBN(document.getElementById('amount').value);
      var sendValue = amount.mul(web3js.utils.toBN(10).pow(decimals));
      console.log(sendValue.toString());
      transferERC20Token(toAddress, sendValue, (txHash) => {
        document.getElementById('result').innerText = txHash;
      });
    }

    window.onload = function() {
      web3js = new Web3(Web3.givenProvider);
      console.log(web3js.version);
      var accountInterval = setInterval(function() {
        web3js.eth.getAccounts((error, address) => {
          if (address[0] !== account) {
            account = address[0];
            console.log(account);
          }
        });

      }, 300);
    }

  </script>

</body>
</html>

https://github.com/piyolab/sushiether/commit/e35e949b5d898d357f9bd1d4e3f35b679974f192