Block Hash
  • Hash256
  • Hash160
  • Reverse Bytes
  • Hexadecimal
  • Satoshis
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Block Hash

The hash of a block header.

A Block Hash is basically a reference number for a block in the blockchain.

How do you get a Block Hash?

You get a Block Hash by hashing the block header through SHA256 twice.

Example

Here’s the serialized block header for block 123,456:

010000009500c43a25c624520b5100adf82cb9f9da72fd2447a496bc600b0000000000006cd862370395dedf1da2841ccda0fc489e3039de5f1ccddef0e834991a65600ea6c8cb4db3936a1ae3143991

(swap endian)

0000000000002917ED80650C6174AAC8DFC46F5FE36480AAEF682FF6CD83C3CA


Tools:
Hash Block Header
Related Pages:
Mining

By Greg Walker,

Last Updated: 02 Apr 2020
  • 02 Apr 2020: added grades
  • 28 Mar 2020: updated html for h1 headers and subheadings - now dynamic from yaml
  • 28 Mar 2020: updated html for h1 headers and subheadings
  • 11 Dec 2019: links to /guide/mining
  • 09 Oct 2019: renamed browser to explorer, glossary to guide, and guide to beginners

Hey there, it's Greg.

I'll let you know about cool website updates, or if something seriously interesting happens in bitcoin.


Don't worry, it doesn't happen very often.