...* * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on ...
知识:智能合约,仅限,正数,被除数
...* * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on ...
知识:智能合约,仅限,正数,被除数
...ing on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when ...
知识:智能合约,仅限,正数,被除数
...* * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on ...
知识:智能合约,仅限,正数,被除数
...assets and heavy losses.This made me puzzled: After game assets are stolen, gifted, or traded, they cannot be returned. After decentralization, the security of game assets has become a big problem. There are many?scammers?and?frauds on the Internet, scams happen again and again. If the security of game assets cannot be guaranteed, investments like NFT games and virtual reality is a very risky spec...
知识:中文网,查看更多,scammers,big
...6 amount, address referrer) public updateReward(msg.sender) checkNextEpoch {require(amount > 0, "Cannot stake 0");require(referrer != msg.sender, "You cannot refer yourself.");super.tokenStake(amount);lastStakeTimes[msg.sender] = block.timestamp;emit Staked(msg.sender, amount);if (rewardReferral != address(0) && referrer != address(0)) {IYFVReferral(rewardReferral).setReferrer(msg.sende...
知识:合约漏洞,DeFi
..., address referrer) public updateReward(msg.sender) checkNextEpoch { require(amount > 0, "Cannot stake 0"); require(referrer != msg.sender, "You cannot refer yourself."); super.tokenStake(amount); lastStakeTimes[msg.sender] = block.timestamp; emit Staked(msg.sender, amount); if (rewardReferral != address(0) && referrer != address(0)) { ...
知识:慢雾,YFValue,一行,代码,如何,锁,定上,亿,资产,
...ed; however assets on each chain have become islands of value, and some breakthrough Defi use cases cannot maximize their value due to the limitation of the local currency on the chain, and the emerging industry of blockchain cannot continue to make strong breakthroughs.However, the process of people's pursuit of freedom has never stopped. For the first time, DeFi applications allow human beings t...
知识:摘要,src,img,现场,老街,公司
...d, however, assets on each chain have become islands of value, and some breakthrough Defi use cases cannot maximize their value due to the limitation of the local coin on the chain, therefore the emerging blockchain industry cannot continue to make strong breakthroughs. This situation needs to be changed urgently.Now, we will inherit the ideas of Satoshi Nakamoto and continue to promote the develo...
知识:摘要,network,service
...：伙计们，很快就可以使用支付宝和微信购买数字货币了！ 支付宝：NO,You Cannot. 友商：就你喜欢秀，这下惨了，都没得玩了。 币安：不是和官方合作的那种，是跟OKEx一样的C2C。 OKEx：躺枪。。。 10号币圈上演了戏剧性的一幕，继9号币安发布开通OTC交易，首批支持BTC、ETH、USDT三种代币的公告后，Binanc...
知识:数字货币,币安,比特币,加密货币
...格 up 1740%REX Borrowed 83% (record high)DAU of EOS Dapp drop 79%EOS Dapp txn up 180% Most users cannot afford CPU to send a txn, driving most Dapps down 60-70% in activities. pic.twitter.com/Obj1hC0EUs DappReview (@dapp_review) November 4, 2019 该事件使人想起了以太坊上的FOMO游戏，该游戏占用了将近60％的电量，并阻止了其他智能合约的正常运行。该案例...
知识:合约,代币,智能合约,挖矿
... contract technology. Simply put, we can understand that ETH can only add a key-value database that cannot be modified. Deploying an intelligent contract is equivalent to adding a key-value pair to this database, the key is the contract address, and the value is the contract code.Ethereum & SolidityBecause of the non-changeability described above, it means that you find problems with the previous ...
知识:合约,以太坊,以太坊的,区块链
... contract technology. Simply put, we can understand that ETH can only add a key-value database that cannot be modified. Deploying an intelligent contract is equivalent to adding a key-value pair to this database, the key is the contract address, and the value is the contract code.Ethereum & SolidityBecause of the non-changeability described above, it means that you find problems with the previ...
知识:NEW,智能合约,以太坊,ETHEREUM
.... It takes time for the residents to accept the new currency, and they also do not adopt it if they cannot adapt it. The third phase is digital currency phase. When digital currency was accepted and traded by certain amounts of people, the digital money became a complementary currency for fiat currency. It means that the issuance of currency is not monopolized by government any more. The nature of...
知识:数字货币,货币,比特币,央行
...了区块链。The assumption nowadays is that we should accept government surveillance because we cannot do anything about it. Stegos frees you from the shackles of government surveillance, enabling to you talk to anyone or pay anyone with absolutely freedom, knowing that neither payments nor communications can be traced back to you!现在设想下我们应该接受政府监控，因为我们无...
知识:公钥,私钥,代币,区块链