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Ethereum: How exactly does -rescan work?

Published by Terlumun Aondover on February 12th, 2025.

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How ​​retracement works in Ethereum: Step by Step

Rescan, also known as -rescan, is a command line argument that allows users to restore their wallet.dat file from a backup and recalculate various data structures in the Bitcoin client. In this article, we will explain how rescan works and why it is necessary.

What happens during a rescan?

Running the “bitcoin-rescan” command with the “-rescan” option will rescan the following files:

• wallet.dat

  : This is the primary wallet file that contains all of your Bitcoin transactions, addresses, and other metadata.

• treasury.dat: This file stores information about your treasury (savings) balance.

During rescan, the client recreates these files using the data stored in the “wallet.dat” file. This process can be time-consuming and requires significant computing resources.

What are the main purposes of rescanning?

There are two main reasons for reverification:

• Re-create a backup: If you have lost access to your wallet file or changed it, re-verification ensures that your data can be restored.

• Re-initialize the client: After a Bitcoin core update or node reconfiguration, it may be necessary to restore the client’s data structures using re-validation.

Is re-scanning necessary?

Yes, re-verification is essential to maintaining a secure and functional wallet. Without this step, transactions can be lost if the backup fails or becomes corrupted. Additionally, re-scanning helps ensure that your balance is accurate and up-to-date.

In summary, re-scanning is a key tool in the Bitcoin ecosystem that allows users to restore their wallets from backup, restore data structures, and re-initialize the client. With -rescan, you can prevent data loss, maintain a secure wallet, and ensure that your transactions are accurately recorded on the blockchain.

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