Blockchain Developer Certification Practice

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Prepare for the Blockchain Developer Certification. Master blockchain concepts with flashcards and multiple choice questions. Explanation-based learning for your success!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What is the purpose of the nonce property in a transaction?

To signify the receiver's address
To indicate the amount of gas used
To count the number of transactions sent by the sender
To store the transaction value

The correct answer is: To count the number of transactions sent by the sender

The purpose of the nonce property in a transaction is to count the number of transactions sent by the sender. In blockchain systems, particularly in Ethereum, each transaction carried out by an account is assigned a unique nonce that serves as a counter. This ensures that each transaction from the same address is processed in the correct order and prevents replay attacks, where a transaction could be broadcasted again. By incrementing the nonce with each new transaction, the network can keep track of the sequence and validity of transactions. This mechanism helps maintain the integrity of the blockchain ledger and ensures that every transaction from the same sender can be uniquely identified and ordered, contributing to the overall security and cohesiveness of the blockchain. Other properties such as the receiver's address, gas amount, and transaction value serve different functions and do not relate to the ordering or counting of transactions.