History of sign_challenge 2 changes

In src/cli/identity.rs, lines 918–939 on e4595038502a2a70b39cedbd575a9282e6ee2a50bc147b094f8f35d8519fa6d6. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 918,939:src/cli/identity.rs.