Hacker News: cylinderthought

Show HN: Deadhand – trustless Bitcoin inheritance in 2 minutes

cylinderthought — Thu, 26 Feb 2026 17:54:13 +0000

Article URL: https://github.com/pyoneerC/deadhand

Comments URL: https://news.ycombinator.com/item?id=47169521

Points: 1

# Comments: 0

New comment by cylinderthought in "[dead]"

cylinderthought — Thu, 26 Feb 2026 14:44:40 +0000

Is llama 3.3 enough? I think Gemini better

New comment by cylinderthought in "Show HN: Show your domains and get buyers message you directly"

cylinderthought — Thu, 26 Feb 2026 14:41:49 +0000

Nice work. I would take a look at x402 to accept payments directly with stablecoins and goes directly to sellers wallet. Easy to do. Most landing domain sucks.

New comment by cylinderthought in "Ask HN: B2B or B2C?"

cylinderthought — Fri, 23 Jan 2026 22:17:00 +0000

do a B2C with a B2B branch

works best

New comment by cylinderthought in "The Slow Death of Productivity: Why Time.sleep() Is Killing Your Automation"

cylinderthought — Fri, 23 Jan 2026 22:16:06 +0000

facts

New comment by cylinderthought in "OpenAI site errors are now generated by AI"

cylinderthought — Fri, 23 Jan 2026 22:14:20 +0000

haha

New comment by cylinderthought in "Ask HN: Who can invite me to lobster.rs?"

cylinderthought — Fri, 23 Jan 2026 22:13:49 +0000

Shamir's Secret Sharing Explained (For Normal People)

cylinderthought — Fri, 23 Jan 2026 22:07:06 +0000

Article URL: https://www.deadhandprotocol.com/blog/shamirs-secret-sharing-explained

Comments URL: https://news.ycombinator.com/item?id=46738619

Points: 4

# Comments: 0

New comment by cylinderthought in "We will rewrite SQLite. And we are going all-in (2025)"

cylinderthought — Fri, 23 Jan 2026 18:27:04 +0000

tremendous

Dead Man's Switch: How to Automate Crypto Inheritance

cylinderthought — Fri, 23 Jan 2026 18:26:03 +0000

Article URL: https://www.deadhandprotocol.com/blog/dead-mans-switch-crypto-inheritance

Comments URL: https://news.ycombinator.com/item?id=46735865

Points: 2

# Comments: 0

What Happens to Your Crypto When You Die?

cylinderthought — Fri, 23 Jan 2026 18:25:34 +0000

Article URL: https://www.deadhandprotocol.com/blog/what-happens-to-crypto-when-you-die

Comments URL: https://news.ycombinator.com/item?id=46735862

Points: 2

# Comments: 0

New comment by cylinderthought in "I built a tool to email my private keys to my wife if I die"

cylinderthought — Fri, 23 Jan 2026 14:05:26 +0000

comments welcome :)

I built a tool to email my private keys to my wife if I die

cylinderthought — Fri, 23 Jan 2026 13:19:20 +0000

Article URL: https://www.deadhandprotocol.com/

Comments URL: https://news.ycombinator.com/item?id=46732144

Points: 2

# Comments: 1

Trustless dead man's switch for crypto

cylinderthought — Thu, 22 Jan 2026 13:04:34 +0000

Article URL: https://www.deadhandprotocol.com/

Comments URL: https://news.ycombinator.com/item?id=46718712

Points: 1

# Comments: 0

Trustless dead man's switch for crypto

cylinderthought — Mon, 19 Jan 2026 22:00:19 +0000

Article URL: https://www.deadhandprotocol.com/

Comments URL: https://news.ycombinator.com/item?id=46685107

Points: 3

# Comments: 0

Show HN: Shardium – open-source "Dead Man's Switch" for crypto inheritance

cylinderthought — Sun, 04 Jan 2026 00:38:23 +0000

maybe i can add stenography

Hi HN, I'm Max.

I built this because I was terrified that if I die tomorrow, my family gets nothing. The existing solutions were either trusting a centralized custodian or complex hardware setups.

Shardium is a client-side tool that splits your seed phrase into 3 shards using Shamir's Secret Sharing.

Shard A: You keep.

Shard B: You give to a beneficiary (PDF).

Shard C: We hold (or you self-host).

It works as a dead man's switch: If you are inactive for 90 days (email ping), Shard C is released to your beneficiary. They combine B + C to recover the funds.

The Stack:

secrets.js-grempe for the math.

FastAPI + PostgreSQL backend.

Client-side encryption (seed never hits the network).

It is 100% Open Source and MIT Licensed. You can self-host it for free ($0), or use the managed version.

I'd love your feedback on the security model. Roast my code here: https://github.com/pyoneerC/shardium

Comments URL: https://news.ycombinator.com/item?id=46483486

Points: 2

# Comments: 0

New comment by cylinderthought in "Show HN: Shardium – open-source "Dead Man's Switch" for crypto inheritance"

cylinderthought — Tue, 30 Dec 2025 18:03:41 +0000

big fan of vaultwarden (i self-host it).

the main difference is architecture: shardium splits the secret (shamir) so the server never holds the full data, whereas vaultwarden holds the full encrypted vault.

also the "grandma factor": getting non-tech family to setup a vaultwarden account was friction. this is just "find paper in drawer, scan qr".

New comment by cylinderthought in "Show HN: Shardium – open-source "Dead Man's Switch" for crypto inheritance"

cylinderthought — Tue, 30 Dec 2025 18:03:06 +0000

100%. i actually use it for my gpg keys too. i need to make that clearer on the landing page so it doesn't look like a "crypto-only" tool. recovering ssh/fido2 backups is a huge use case. thanks for the feedback

New comment by cylinderthought in "Show HN: Shardium – open-source "Dead Man's Switch" for crypto inheritance"

cylinderthought — Tue, 30 Dec 2025 02:02:21 +0000

running 4-of-2 definitely removes the service dependency.

you highlighted exactly the "bug" i wanted to patch though: the collusion risk. if beneficiary A and B have a beer together, you get rugged.

the "live service" here acts purely as a time-lock. beneficiaries can't collude to rob you today because the 3rd shard isn't released until the dead man's switch actually triggers. it protects you from your own friends.

Show HN: Shardium – open-source "Dead Man's Switch" for crypto inheritance

cylinderthought — Mon, 29 Dec 2025 22:46:50 +0000

Hi HN, I'm Max.

I built this because I was terrified that if I die tomorrow, my family gets nothing. The existing solutions were either trusting a centralized custodian or complex hardware setups.

Shardium is a client-side tool that splits your seed phrase into 3 shards using Shamir's Secret Sharing.

Shard A: You keep.

Shard B: You give to a beneficiary (PDF).

Shard C: We hold (or you self-host).

It works as a dead man's switch: If you are inactive for 90 days (email ping), Shard C is released to your beneficiary. They combine B + C to recover the funds.

The Stack:

secrets.js-grempe for the math.

FastAPI + PostgreSQL backend.

Client-side encryption (seed never hits the network).

It is 100% Open Source and MIT Licensed. You can self-host it for free ($0), or use the managed version.

I'd love your feedback on the security model. Roast my code here: https://github.com/pyoneerC/shardium

Comments URL: https://news.ycombinator.com/item?id=46426857

Points: 4

# Comments: 6