proof-of-engagement

        event.created_at = Clock::get()?.unix_timestamp;        event.bump = ctx.bumps.event;         // Increment club's total events        let club = &mut ctx.accounts.club;        club.total_events = club.total_events.checked_add(1).unwrap();         msg!("Event created: {} for club: {}", event.name, club.name);        Ok(())    }     /// Record attendance for an event with photo proof    pub fn record_attendance(        ctx: Context<RecordAttendance>,        photo_hash: String,    ) -> Result<()> {        require!(photo_hash.len() <= 128, ErrorCode::PhotoHashTooLong);                let event = &mut ctx.accounts.event;        require!(event.is_active, ErrorCode::EventNotActive);        require!(            event.current_attendance < event.max_capacity,            ErrorCode::EventAtCapacity        );

1. Line 61 event.created_at = Clock::get()?.unix_timestamp;: Reads on-chain time from the Clock sysvar.
2. Line 62 event.bump = ctx.bumps.event;: Uses the bump seed, the extra byte that pushes the derived address off the ed25519 curve.
3. Line 66 club.total_events = club.total_events.checked_add(1).unwrap();: Uses checked arithmetic so overflow fails instead of wrapping.
4. Line 68 msg!("Event created: {} for club: {}", event.name, club.name);: Logs to the program log, which is visible in explorers and the test output.
5. Line 77 require!(photo_hash.len() <= 128, ErrorCode::PhotoHashTooLong);: An explicit validation that aborts the instruction with an error.