---
description: >-
  The Initial Block Download (IBD) refers to the process by which nodes
  synchronize with the network by downloading blocks that are unfamiliar to
  them.
---

# Initial Block Download (IBD)

The Initial Block Download (IBD) refers to the process by which nodes synchronize with the network by downloading blocks that are unfamiliar to them.

This synchronization occurs when a node is significantly lagging behind the peak of the best blockchain. During the IBD process, a node does not acknowledge incoming transactions or request transactions from the mempool.

In setting up a new node by following the provided instructions, you will engage in the IBD process during the first run. This process might be time-consuming as a new node must download the entire blockchain, which is approximately 340 gigabytes as of now. Throughout the download period, expect high network and CPU usage as the node verifies the downloaded blocks, and be prepared for the client to gradually occupy more storage space (more details on reducing storage can be found in the 'reduce storage' section).

Until the IBD is complete, new transactions related to your account will not be visible. The client must first catch up to the block containing the relevant transaction. Hence, your wallet may not reflect new payments or expenditures in the balance during this period.

If you are utilizing the Bitcoin Core GUI, the IBD progress can be monitored in the status bar located at the bottom left corner.
