问题标签 [erc20]

我将在 web3.js 中使用哪个函数从我的网站购买 erc20 令牌？

我正在尝试将DAI代币从用户钱包0xDAIUserWallet 交易到一些随机代币合约，比如0xRandomContractAddress。在这种情况下，我使用 DAI 用户的私钥来签署交易并支付汽油费，因为他是代币的所有者。

我正在寻找的是使用 DAI 用户私钥签署交易，但汽油费应该由其他钱包支付。

我正在使用使用solidity 设计的标准ERC20 以太坊智能合约，并使用ethers.js 与智能合约进行交互。

我想将 erc20 代币从一个账户转移到另一个账户。我知道我可以使用智能合约包装类的 transfer 或 transferFrom 函数。但就我而言，erc20 令牌交易需要在客户端进行签名。并且没有办法在智能合约包装函数中传递 signedTransaction。那么，如何签署 erc20 令牌交易并在 java 中使用 web3j 执行交易。

我发现了这个类似的问题。但是，它的代码不是用java编写的。而且我不知道如何在 ABI 中编码传递函数。 使用 web3 发送 ERC20 令牌

提前致谢。

我正在尝试在 REMIX IDE 上部署 ERC777 测试合约；但是当我尝试交易合同时，虚拟机给了我以下错误

虚拟机错误：还原。revert 事务已恢复到初始状态。注意：如果您发送值并且您发送的值应该小于您当前的余额，则调用的函数应该是应付的。调试事务以获取更多信息。

以下是用于部署的参数

参数-空

参数填充

参数：testing, TST, ["0xdD870fA1b7C4700F2BD7f44238821C26f7392148"], 10000

您能否检查我的代码并告知遗漏的内容。

// 文件：contracts\open-zeppelin-contracts\token\ERC777\ERC777.sol

// 文件：TestToken.sol

有什么方法可以防止智能合约中的代币从地址 A 转移到地址 B？假设它需要智能合约所有者的某种批准。假设它不是 ERC-20 代币。

我想在 Libra TestNet 中创建我的自定义令牌。我对移动编程语言了解不多，需要很多帮助。是否可以创建我们自己的实现并在 Libra 测试网中执行？

什么是示例实现代码？请提供一些有关创建它的指导。

因此，经过一天的搜索和许多紫色链接后，我除了问一个关于该主题的问题十几次外，别无他法，但不知何故，每个问题都是独一无二的。

信息：

• 节点 v12.16.1

• 通过 Infura API 的 Ropsten 测试网

• “web3”：“1.2.6”

• “ethereumjs-tx”：“2.1.2”

• ERC20 代币示例，将代币名称和小数更改为 8 和pragma solidity ^0.5.2;

重要提示：智能合约是通过 Remix（使用 0.5.3 编译器）编译和部署的，transfer()方法通过 Metamask 测试成功。

此代码产生此错误： - EVM 已恢复事务

有趣的事实：

• 当我尝试通过部署智能合约时遇到同样的问题web3.eth.sendSignedTransaction()

• 在兔子洞之后，我找到了将 web3 版本降低到1.0.0-beta.34 的潜在解决方案，当我这样做时，我遇到了 gas 问题——转账交易需要很长时间，最终我的 gas 用完了。大多数问题是：或intrinsic gas too lowTransaction ran out of gas. Please provide more gas

我有一个想法，我需要写一份白皮书并进行 ICO。我很想知道在我发布白皮书后会发生什么，其他人也可以窃取同样的内容并提出平台。我们如何防止这种情况？

我昨天构建的代码错误

我使用混音 -> METAMASK Ropsten 测试网

实用性 >=0.4.19

错误内容

创建信用待处理...创建信用错误：错误：[ethjs-rpc] rpc 错误，有效负载 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[object Object]

你能帮我解决这个问题吗？

我有一个 Eth 合约，称为控制器，用于：

1. 生成新的 eth 存款地址，每个用户一个，这也是一个 eth 合约。
2. 当用户向他们存入 eth 或 erc20 代币时，扫描这些存款合约。资金最终进入另一个中央 eth 账户。

许多 erc20 代币似乎运行良好，但 USDT 存款交易被恢复：https ://etherscan.io/address/0x3cd5a0dc36a8f22011193f2a03910aa8260e64db

如果没有这些合约的原始源代码（虽然我有 JSON ABI），很难说：

1. 为什么 USDT 失败。
2. 如果这些真的可以支持 USDT，或者这样做会涉及什么。

如果有人能指出正确的方向，将不胜感激！

控制器合约：0xEb818C6a48cCd60A8078aaa20997cC3CB2538C9E

另一个与控制器相关的合同，称为 defaultSweeper：0x8e7ABAF1316A0edB985e494F572Fdf148e8a7E93

编辑：似乎 USDT 合约缺少一些 erc20 方法。喜欢transfer看：https ://erc20-verifier.openzeppelin.com/这是为什么？