"Super Shamir" support? about paperback HOT 1 OPEN

This solves a threat model where you want recovery to absolutely require a third party or an international flight.

Example 1:
2 shares; local, international, threshold 2
4 sub-shares in country of residence, threshold 2
4 sub-shares abroad, threshold 2

Were it 4 of 8, the secret can be recovered without the flight. While 5-6 of 8 are easier to lose.

Example 2:

3 shares; personal, heir; executors, threshold 2
5 personal sub-shares, threshold 3
5 heir sub-shares, threshold 3
5 executor sub-shares, threshold 3

Were it 6 of 15, one betraying executor could collude with heir to inherit early or 5 betraying executors could steal one share from you or your heir to recover. This requires stealing 3. Raising threshold to 8 of 15 would be easier to lose; any of the 3 groups could then only lose 2 shares Total and recover rather than lose 2 Each and recover.

from paperback.