tx: add support for computing an elements transaction discount #456
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As specified in ELIP 0200. The discount is computed as the difference between the actual tx weight and the weight if the tx had only non-confidential outputs, i.e. it makes confidential txs cost the same as non-confidential ones.
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The discount is computed as the difference between the actual tx weight and the weight if the tx had only non-confidential outputs, i.e. it makes confidential txs cost the same as non-confidential ones.
See https://github.com/ElementsProject/ELIPs/blob/main/elip-0200.mediawiki for context.