In 2136, each block reward will be a single satoshi. However you won’t be able to spend it unless you already have a satoshi because you have to pay the network fee. However there may be miners at that point willing to pick up single satoshi transactions just to help put them back in circulation. nostr:note1cqeaz0rpvf9583ykydszd8phaxyezt2uz37gpjml5jx7w6e75r7sg70ww3