Flashpaper – Self-destructing secret sharing with no database

Hacker News

Hi everyone! This is my first HN and I’m very new to the scene. My name is Min from Bangkok. At first, I just want to create a dead man's switch for personal use and for fun. then, I think about information that self destruct like a spy movie. after that, I try to come up with the better version of Privnote or Bitwarden with self-destruct and some kind of censoring or blocking download ability. Somehow, end up with this product. :O Flashpaper is for sending any information that would be burned after reading (with counting down timer like Mission Impossible movie ! or after 24 hrs max if not opened) Encryption happens in browser and because the key stays after # in the link; server never sees the key (Zero-knowledge for web use) and— because I’m a newbie. I don’t want to connect to database because I don’t have the money and I want things light and simple. So, that’s why Flashpaper keeps things in RAM-only, no database. For AI Agent side, Flashpaper provides a REST API and an MCP server so agents can create secret links easily in dead-drop style that can be claimed only once. The second claim would get a 404 which means someone already took it. However, for the agent API flow, the server sees the plaintext for a moment before encrypting, so this flow is not zero-knowledge like the web flow. Overall, I think it work quite well for web use, but for agent API use, I am not sure this is enough security. All the limitations are listed in SECURITY.md. Some feedback would be appreciated. I make it open source with MIT license, with honorware policy for Enterprise use, like self-hosted docker. Here is my repo https://github.com/mmmpym/flashpaper and you can try it here https://flashpaper.app Again ! Please feel free to tell me what I missed. Min

Visit product View on Hacker NewsJul 28, 2026

Share card

Actual performance

25points

12comments

Made the leaderboard

Launch Intel predictions

Analyze your own launch →

Product HuntOn track for Day 1 leaderboard · Strong signals: agents, agent, mcp · Missing: mac, macos, cursor

91%91% predicted probability of success on Product Hunt, based on ML models trained on real launch data.

best fitHighest predicted score across all platforms for this description.

Indie HackersFits the IH revenue-focused audience · Missing: supports, reddit linkedin, podcasting

75%75% predicted probability of success on Indie Hackers, based on ML models trained on real launch data.

Hacker NewsStrong engagement from HN community · Strong signals: open source, ide, io · Missing: https docs, excited, just released

57%57% predicted probability of success on Hacker News, based on ML models trained on real launch data.

nativeThis product was originally launched on this platform.

TrustMRRLess likely to generate early MRR · Strong signals: personal · Missing: mobile apps, ios, entrepreneurs

48%48% predicted probability of success on TrustMRR, based on ML models trained on real launch data.

AppSumoMay struggle as an AppSumo deal · Strong signals: host · Missing: plus, platform, intuitive

44%44% predicted probability of success on AppSumo, based on ML models trained on real launch data.

Acquire.comPre-revenue stage for this audience · Missing: arr, mrr, revenue

22%22% predicted probability of success on Acquire.com, based on ML models trained on real launch data.

BetaListMay not resonate with beta-testers · Missing: web3, chat, crypto

0%0% predicted probability of success on BetaList, based on ML models trained on real launch data.

Correct prediction on native model

Similar products

SHOW HN: Secret sharing in the browser57%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

SHOW HN: Secret sharing in the browser

Hacker News2

DiceSlice – Secret Sharing in the Browser62%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

DiceSlice – Secret Sharing in the Browser

Hacker News1

Multipass, secret sharing for teams55%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Multipass, secret sharing for teams

Hacker News2

CLI App for Shamir's Secret Sharing40%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

CLI App for Shamir's Secret Sharing

Hacker News4

Horcrux, a Playground for Shamir Secret Sharing54%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Horcrux, a Playground for Shamir Secret Sharing

Hacker News151

Shamir Secret Sharing in Java 11+36%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Shamir Secret Sharing in Java 11+

Hacker News3

Hemmelig.app – Self hosted secret sharing application58%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Hemmelig.app – Self hosted secret sharing application

Hacker News8

Shamir Secret Sharing TypeScript Implementation42%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Shamir Secret Sharing TypeScript Implementation

Hacker News1

farMFA – Generate TOTP Codes via Shamir's Secret Sharing46%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

farMFA – Generate TOTP Codes via Shamir's Secret Sharing

Hacker News2

Secret combinations of the CCP and other threats to democracy49%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Secret combinations of the CCP and other threats to democracy

Hacker News2

Browse all products Analyze your launch