FIGURE 5.
A blockchain network with six transactions and 12 addresses. Addresses a 1, a 2, a 3, a 4 receive coins from earlier transactions that are not shown here. Transaction t 5 uses a previously used address a 1 in edge e 1. Edge e 2 denotes an address reuse where the change is sent back to the sender address a 10. Dashed edge e 3 cannot be created with the given transactions, because a 5 receives only a single output in t 1. In this network, outputs of t 5 (to addresses a 1 and a 11) and t 6 (to addresses a 12 and a 10) remain unspent