[mercer]

To me it seems that there are two separate problems: 1) storying the information you want released upon your death, and 2) keeping it secure until that time.

For storing, perhaps a torrent or blockchain approach might work, where the encrypted data is stored on the computers of many users who 'buy into' this.

For release, I still feel that the safest way would be to give the 'key' to a trusted person (perhaps along with your will?). Any other approach leaves something so important too uncertain.