What does the extraData field of a block represent?

Question

I am trying to save some data into a block. The extraData field has a constant value since block 1. Also where does the data parameter of sendTransaction() function get stored?

score 3 · Answer 1 · answered Jun 16 '17 at 18:08

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Please find reference in this answer here: What does each genesis.json parameter mean?

Excerpt here: "extraData An optional free, but max. 32-byte long space to conserve smart things for ethernity."

answered Jun 16 '17 at 18:08

vmatekole

39
3

Or, to paraphrase, you can put anything you want in the extraData field. – lungj Jul 16 '17 at 22:44
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Some mining pools use it for logging their blocks. – Paul Razvan Berg Sep 21 '18 at 10:18

What does the extraData field of a block represent?

1 Answers1