History of sign_challenge 2 changes

In src/cli/identity.rs, lines 953–974 on e980087ed0b1f55e860ad4e186df47d4577445c0591ca6f5d97ea73a2cdc7589. 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 953,974:src/cli/identity.rs.