Book Image

Building Blockchain Projects

By : Narayan Prusty
Book Image

Building Blockchain Projects

By: Narayan Prusty

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.
Table of Contents (16 chapters)
Title Page
About the Author
About the Reviewers
Customer Feedback

Calculating a transaction's nonce

For the accounts maintained by geth, we don't need to worry about the transaction nonce because geth can add the correct nonce to the transactions and sign them. While using accounts that aren't managed by geth, we need to calculate the nonce ourselves.

To calculate the nonce ourselves, we can use the getTransactionCount method provided by geth. The first argument should be the address whose transaction count we need and the second argument is the block until we need the transaction count. We can provide the "pending" string as the block to include transactions from the block that's currently being mined. As we discussed in an earlier chapter, geth maintains a transaction pool in which it keeps pending and queued transactions. To mine a block, geth takes the pending transactions from the transaction pool and starts mining the new block. Until the block is not mined, the pending transactions remain in the transaction pool and once mined, the mined transactions...