Stories about objects left in the wake of transactions, from cryptocurrencies to leaf-imprinted banknotes to records kept with knotted string. Museums are full of the coins, notes, beads, shells, stones, and other objects people have exchanged for millennia. But what about the debris, the things that allow a transaction to take place and are left in its wake? How would a museum go about curating our scrawls on electronic keypads, the...