As mentioned, the standard dictates that an event be emitted when the approve() function is called:
event Approval(address indexed _owner,
address indexed _spender,
uint256 _value);
- Title Page
- Copyright and Credits
- About Packt
- Foreword
- Contributors
- Preface
- Say Hello to Blockchain
- Building a Bitcoin Payment System
- Building Your Own Cryptocurrency
- Compiling Bitcoin from source
- New cryptocurrency – Readercoin
- Cloning Bitcoin
- Readercoin rebranding
- Changing the ports
- Changing pchMessageStart
- Genesis block
- Removing the seed nodes
- Checkpoints
- ChainTxData
- Rewarding
- Halving
- Total supply
- POW parameters – target
- Time maturity
- Block size
- BIPs: Bitcoin Improvement Proposals
- Compiling and testing
- Design and graphics (Qt wallet)
- Redesign of the Bitcoin-Qt wallet
- Building a Readercoin network
- Readercoin mining
- Sending transactions
- Building a transaction and block explorer
- Building an exchange market
- Summary
- Peer-to-Peer Auctions in Ethereum
- Introduction to Ethereum
- Building an auction DApp 
- Auction description
- Auction contract in Solidity
- Contract code analysis
- Inheritance
- Remix IDE
- Bidding form in web3.js
- Introduction to the web3.js API
- Deployment environment – multiple ways to enjoy!
- Running the auction DApp
- Summary
- Tontine Game with Truffle and Drizzle
- Background
- Truffle quick start
- The Tontine contract
- Cplayer as a CRUD contract
- Tontine interfaces – Itontine
- Interface implementation – Ctontine contract
- Truffle unit tests
- Frontend with Drizzle
- Trying the DApp
- Summary
- Blockchain-Based Futures System
- Blockchains in Business
- Creating an ICO
- What is an ICO?
- Project setup
- Token contracts
- Token sale contracts
- Implementing our token sale contract
- Contract security
- Testing the code
- Deploying to a test network
- Verifying our contract code on Etherscan
- Creating a frontend website
- Summary
- Suggestions for further work
- Distributed Storage IPFS and Swarm
- Supply Chain on Hyperledger
- Letter of Credit (LC) Hyperledger
- Other Books You May Enjoy
Approval event (required)
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