If either key is lost, the seed phrase CANNOT be decrypted. This is the risk of self custody. Unless there are other means of retrieval, the Bitcoin is gone. Legacy does not save any data.
Yes. You can create as many Benefactor/Beneficiary key combinations as you like, each associated with a different seed phrase.
Download "Legacy-offline.html" from github. Disconnect from wifi. Open the file in a web browser.
No. Beneficiary Key and Benefactor Key may contain all uppercase, lowercase, numbers, and special characters.
The Beneficiary needs to receive:
1. Benefactor Key
2. Encrypted Seed Phrase
3. Working copy of "Legacy-offline.html"
See Deadman Switch options for setup guidance.
Your encryption is only as strong as your keys are secure. The stronger the keys, the harder to brute force. Use long, random strings — not memorable words or phrases. Record your keys and store them somewhere safe, but keep the Benefactor Key and Beneficiary Key separate. Avoid ambiguous characters such as 0 (zero) and O (letter O), or 1 (one) and l (letter L), which are easy to confuse when transcribing by hand.
Visit the Protocol page for detail summary.