History of sign_challenge 2 changes

In src/cli/identity.rs, lines 918–939 on 157d02e955868ee277f6069430bfc29157a04ce406f691b7da7e07e338e6c895. 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.