Yes, Grin can implement payment channels based on NoRecentDuplicate kernels, as outlined in this RFC grin-rfcs/text/0013-nrd-kernels.md at master · mimblewimble/grin-rfcs · GitHub
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Yes, Grin can implement payment channels based on NoRecentDuplicate kernels, as outlined in this RFC grin-rfcs/text/0013-nrd-kernels.md at master · mimblewimble/grin-rfcs · GitHub