The formula to calculate the target of a block requires the current timestamp, and also every block has the current timestamp attached to its header. Nothing can stop a miner from using some other timestamp instead of the current timestamp while mining a new block, but they don't usually because timestamp validation would fail and other nodes won't accept the block, and it would be a waste of resources of the miner. When a miner broadcasts a newly mined block, its timestamp is validated by checking whether the timestamp is greater than the timestamp of the previous block. If a miner uses a timestamp greater than the current timestamp, the difficulty will be low as difficulty is inversely proportional to the current timestamp; therefore, the miner whose block timestamp is the current timestamp would be accepted by the network as it would have a higher difficulty. If a miner uses a timestamp greater than the previous block timestamp and less than the current timestamp, the difficulty...
Building Blockchain Projects
By :
Building Blockchain Projects
By:
Overview of this book
Blockchain is a decentralized ledger that maintains a continuously growing list of data records that are secured from tampering and revision. Every user is allowed to connect
to the network, send new transactions to it, verify transactions, and create new blocks,
making it permission-less.
This book will teach you what blockchain is, how it maintains data integrity, and how to create real-world blockchain projects using Ethereum. With interesting real-world
projects, you will learn how to write smart contracts which run exactly as programmed
without any chance of fraud, censorship, or third-party interference, and build end-to-e
applications for blockchain.
You will learn about concepts such as cryptography in cryptocurrencies, ether security, mining, smart contracts, solidity, and more. You will also learn about web sockets, various API services for Ethereum, and much more.
The blockchain is the main technical innovation of bitcoin, where it serves as the public ledger for bitcoin transactions.
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Current Title:
Building Blockchain Projects
Table of Contents (16 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
Free Chapter
Understanding Decentralized Applications
Understanding How Ethereum Works
Writing Smart Contracts
Getting Started with web3.js
Building a Wallet Service
Building a Smart Contract Deployment Platform
Building a Betting App
Building Enterprise Level Smart Contracts
Building a Consortium Blockchain
Customer Reviews