Add deadhand to Cryptography section for digital inheritance management

[pyoneerC]

Description

Added Deadhand Protocol - A dead man's switch for crypto inheritance using Shamir's Secret Sharing.

Why it belongs

• Non-custodial crypto inheritance tool
• Uses industry-standard SSS cryptography
• Source-available under BSL 1.1
• Solves a real problem (billions in lost crypto due to dead owners)

[Hars838]

Bro great

[JinyangWang27]

@pyoneerC Thank you for your submission. Unfortunately, this PR doesn't meet our acceptance criteria:

Repository age: The repository was created 1 month ago. We require a minimum of 3 months (or 6 months for Hidden Gem submissions) to ensure project stability.
GitHub stars: 21 stars (minimum 100 required, or strong justification for Hidden Gem).
Category placement: This is a tool for crypto inheritance, whereas the Section Crytography is mostly for algorithm/code for encryption.

Please see our CONTRIBUTING.md for full requirements. You're welcome to resubmit once the project has matured and gained community traction.

[pyoneerC]

Bro great

thanks, @Hars838! you can find all the docs here: https://deepwiki.com/pyoneerC/deadhand

Feel free to clone it or reach out if you want to chat :)