Hereditas: Open in Case of Death or Disappearance (github.com)

For a more thorough explanation, here's another link: https://tinyurl.com/digitalblackbox

The author of the software notes in the description that he is looking for help in the security/cryptography field. I really think he's got something special there, so I wanted to bring it to everyone's attention. I have no affiliation whatsoever, this simply popped up on my "recommended" area on Github.