I want to create a OP_RETURN script on bitcoin core console. Not using GUI, i.e. available on proofofexistence.com , Just as we create raw transaction and then sign it and then broadcast it, I am curious about how to create OP_RETURN script. Anyone here can give reference or want to share their knowledge? Step by step explanation would be much appreciated.

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createrawtransaction has an option for data. That will create an OP_RETURN output with whatever hex-encoded data you want in it. So you would have a createrawtransaction command that looks something like this:

createrawtransaction '[]' '{"data":"deadbeef"}'

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