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In the SCP white-paper it's mentioned that when a node votes on a proposal, it promises that it has never voted against that proposal.

However, how exactly would a node vote "against" a proposal? Does voting against a proposal imply just abstaining from voting for that value? There are Prepare, Nominate, Confirm, and Externalize message types, but I am not aware of any "RejectNomination" type of messages.

Edit: Specifically, it's mentioned that a node may nominate multiple proposals. So what does it mean to reject a proposal?

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Ah I understand it better now after reading https://medium.com/interstellar/understanding-the-stellar-consensus-protocol-423409aad32e, it's defined at the application level.

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