Hidden message after “The End” – A cryptic memory fragment as narrative epilogue

Hello there :)

I'm wrapping up a poetic hard sci-fi novel set in a far-future universe, where consciousness is treated as a recoverable field of information, and memory itself might outlast stars.

The story unfolds across two distant timelines that eventually resonate: one, anchored in the final flickers of the cosmos; the other, in a nearer present where a quantum physicist once believed memory could survive death.

After the final chapter, I wanted to leave something behind. Not an epilogue, not a sequel hook, but an echo, a fragment that says, "this world isn't entirely done speaking."

So I wrote this as the last page:

// Final echo log: [Archivist Memory Fragment #E42-US]
[45 6D 6D 79 20 77 ░9 6C 6C 20 ▓5 74 75 ▒6 6E 2E 2E 2E]
> fragment integrity compromised
> partial semantic recovery achieved

For readers who take the time to decode the hexadecimal ASCII, the message reveals itself as:

!“Emmy will return…”!<

She’s a key character from earlier in the story, but by the time this message appears, she’s already more memory than presence.

It’s not a direct teaser for a sequel, but a signal that this universe will holds more than one story — and some echoes do return, quietly, through time.

I’d love to know:
Have you ever used subtle post-ending artifacts like this?
Do you enjoy embedding fragments — data logs, corrupted transmissions, marginalia — that extend the world beyond the final page?

Happy to hear any thoughts or shared techniques!