Chapter 329: Cold Backup and Timestamp

The car navigation’s voice prompts sounded monotonous on the empty ring road. Lin Chen turned off the audio, leaving only the white noise of tires rubbing against the asphalt. A dull ache in his left ankle pulsed rhythmically with each press of the accelerator, like a taut string repeatedly pulling beneath his skin. He adjusted his posture, shifting his weight to the right, and used his right foot to modulate the throttle. In the rearview mirror, the glass curtain walls of the city center gradually gave way to low-rise residential compounds and old plane trees. 1:20 PM. Three hours and forty minutes until five. Enough time, but with virtually zero margin for error. If any single link jammed, the seventy-two-hour countdown would drop straight to zero.

The car turned into "Keyuan Xincun" in the suburbs. Six-story slab buildings from the late nineties, their beige exterior paint now mottled, with AC unit brackets rusting into dark red water stains. Lin Chen parked, picked up his laptop and a shockproof case, and walked toward the institute’s archive building. No elevator in the stairwell; the edges of the concrete steps were worn smooth and shiny. He held the wall as he climbed, avoiding the ball of his left foot when stepping down and bearing the weight on his heel. Third floor, Archive Room 3. The iron door was ajar. Inside came the creaking of an old ceiling fan spinning, mixed with the smell of old paper, mothballs, and dry dust.

Pushing the door open, he saw an old man in a faded polyester-cotton shirt sitting in a rattan chair, sorting through files. His hair was completely white, he wore reading glasses, and the age spots on the backs of his hands looked like dried mud splatters. It was Director Zhou, Old Zhou, who had retired in 2022. Lin Chen stood at the doorway and quietly stated his name and purpose. Old Zhou looked up, his gaze lingering on Lin Chen’s face for two seconds. He seemed to recognize something, or perhaps he was just looking at a young man following procedure.

"The key is in the bottom drawer of the metal cabinet," Old Zhou pointed to the corner, his voice hoarse but steady. "A cold backup left during the 2016 handover. The password is the anniversary date in reverse. You’re all doing digitalization now, but you still recognize this old relic?"

Lin Chen nodded, walked over, and crouched down. The latch on the metal cabinet was a bit rusty and stiff; he pulled it open with some effort. At the bottom lay a faded anti-static bag containing a black USB dongle, with a handwritten label next to it: LTO-5 Project Signature Key - Backup. He took out the dongle and plugged it into the side port of his laptop. The system prompted that an older version of the driver needed to be installed. He brought up a local virtual machine and loaded a 2016 system image. The progress bar advanced slowly, and the fan noise gradually grew louder. Old Zhou handed him a cup of warm water without a word, continuing to flip through his files. The sound of rustling paper was faint, like a slow, steady breath.

Driver installation complete. Lin Chen opened the signing tool, imported the expired certificate, and selected the backup key to re-sign. A dialog box popped up on the screen: Certificate chain break detected. Force verification using local root certificate? He checked "Yes". His finger hovered over the Enter key. Once executed, the generated file would carry the original 2016 timestamp and digital fingerprint. Legally and in archival logic, it would be equivalent to the original signature from that year. He pressed Enter.

Hot air blew from the laptop’s vents. Lin Chen stared at the code scrolling on the screen. Calculating hash... Encapsulating ASN.1 structure... Signature generation successful. He exported the PDF and opened the preview. In the digital signature area at the bottom right, a green checkmark and the words "Signature Valid" were displayed. Timestamp: 2016-11-08 14:32:00. On that afternoon eight years ago, he had still been hand-copying Python code in an internet cafe in a county town, while this batch of data had already been sleeping in this system for over three thousand days and nights. Dust settled into the tapes, data turned into bytes, and time folded within the machines. He opened his error notebook and wrote in the blank space: Cold backup key functional. Certificate chain force verification passed. Physical medium and digital signature complete logical closed loop.

He closed the laptop and re-uploaded the file via the car’s hotspot. The phone screen lit up: Receiving file... Verifying... The progress bar stuck at eighty-seven percent. Network fluctuation. Lin Chen didn’t move, just watched the screen. His left foot began to cramp again, the muscles trembling slightly beneath his pant leg. He reached out, pressed his hand against his calf, and pushed down hard. The pain turned into a dull numbness; his breathing rhythm didn’t falter. He counted seconds silently. Ten, twenty, thirty. The progress bar jumped past ninety percent, ninety-five percent, one hundred percent.

Upload successful. System is parsing the declaration file.

The page refreshed. The status bar changed from "Pending Supplement" to "Under Review". Estimated processing time: two hours. Lin Chen leaned back in his chair and let out a long breath. He turned to look out the window. The setting sun was slanting through the branches and leaves of the plane trees, casting long shadows across the archive room’s concrete floor. Dust settled slowly in the shafts of light. Old Zhou closed his files, took off his reading glasses, and rubbed the bridge of his nose. "Now that you’ve got what you came for, you’d better get going," he said. "Machines don’t wait for people, and people don’t wait for machines."

Lin Chen nodded, packed up the dongle and his computer. He walked to the door, paused for a moment. "Director Zhou, thank you." Old Zhou waved his hand without turning around.

Down the stairs, into the car. Started the engine. The phone vibrated. A text message from the archival system: Initial inspection materials approved. Data pool unlocked. Please confirm whether to initiate the next phase model training task?

Lin Chen stared at the line of text. The screen’s light reflected on his face. He tapped the confirm button, but stopped just before his fingertip made contact. Once the training task started, it would consume the company’s last remaining computing power quota. If it failed, the capital chain would break completely, and the vertical model Su Man had been waiting three years for would have to be rebuilt from scratch. If it succeeded, the first batch of cleaned industry corpora could be fed into the underlying architecture, completing the first round of iteration. No way back, and no middle ground.

He withdrew his hand and took out the error notebook from the storage compartment. He flipped to the latest page, which contained only one line: 2024.11.08 - Medium verification complete. Next step: Computing power allocation and risk isolation. The pen tip paused on the paper. He wrote a supplementary clause: Don't gamble on probability, only control variables. Scale training parameters down to 0.7, reserve 30% computing power for anomaly rollback. If it fails, switch to backup nodes, do not touch cash flow.

He closed the notebook, shifted gears. The car drove out of the residential compound and merged into the evening traffic. Taillights trailed red streaks in the dusk. Thirty-nine hours remained on the countdown. But the real countdown was only just beginning. The navigation screen lit up, showing a gas station two kilometers ahead. He turned on the signal, changed lanes, and slowed down. The fuel tank was a quarter full. He’d have to make another trip to the server room tomorrow. The road was still long; he needed to fill the tank.