History of sign_challenge 2 changes

In src/cli/identity.rs, lines 918–939 on 9aec107d1071104cac89c32434f29b484a7389cb8b9bfd8f943bbda5116ca102. 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.