History of sign_challenge 2 changes

In src/cli/identity.rs, lines 918–939 on c895bc52e4e037ad477508b097a23c089e679f5d005abc0e852403268c722d3b. 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.