Block Hash

Block Hash The hash of a block's 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.


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


(swap endian)


Hash Block Header
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By Greg Walker,

Last Updated: 26 Nov 2018
  • 26 Nov 2018: Added sub titles to every page.
  • 25 Nov 2018: Subtitles for pages in Glossary. Looks good.
  • 14 Mar 2018: Renamed block-id to block-hash, finally

Hey there, it's Greg.

I'll let you know if something seriously interesting happens in bitcoin.

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