21Relay
Run Your Node

Stage 4 of 7

Synchronise and verify the chain

Initial block download is verification work, not simply copying a database. Let the node finish before relying on it for wallet verification.

  1. 1Choose setup
  2. 2Check hardware
  3. 3Install
  4. Synchronise
  5. 5Maintain
  6. 6Improve privacy
  7. 7Troubleshoot

What to expect

Headers first

The node learns block headers, then downloads and validates block contents and transactions.

CPU and SSD activity

Historical signature checks and chainstate updates can keep the processor and SSD busy. Speed varies substantially by hardware.

Pruning happens after validation

A pruned node still validates old blocks before deleting eligible block and undo files.

Healthy sync checklist

  • Block and header counts continue moving
  • Verification progress increases over time
  • The latest block time becomes more recent
  • Peer connections remain available
  • Free disk space stays above your planned reserve
  • No persistent warning remains unexplained

Technical checks

  1. 1

    Check blockchain state

    Run bitcoin-cli getblockchaininfo or use the GUI Information window.

    Expected result: blocks approaches headers; verificationprogress approaches 1; initialblockdownload becomes false.

  2. 2

    Check networking

    Run bitcoin-cli getnetworkinfo or view peer information in the GUI.

    Expected result: networkactive is true and connections is above zero.

  3. 3

    Wait for completion

    Keep the node open and prevent sleep. You can pause by shutting down normally and resume later.

    Warning: Do not unplug its data drive or force power off during active database writes.

Official sources

Stage progress

Mark this stage complete when you are ready to continue.