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How would I be able to put data in the extra field for say a nonce or whatever?

  • For the coinbase TX? Modify the code, I suppose. Not sure XMR's so-called "getblocktemplate" would allow for this, so you MAY have to make your own block. – Wolf0 Dec 18 '16 at 17:45
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When using the getblocktemplate RPC, you can pass a reserve_size argument. You will get a block template and a reserve_offset, and then starting at reserve_offset in the block template, you can put reserve_size bytes of whatever you want.

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