I want to create public key from parent e public key like this:

enter image description here

In this picture I can see left 256 bits and it's become 264 after "sum" with parent public key.

But 256 bits what is it?

When Extending a parent private key to create a child private key, (see picture)

enter image description here

left 256 bits is child private key

  • Could you clarify your question? Which part of the graph you are asking what it is? – Mike D Feb 11 at 17:02

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