I have seen questions come up in this thread which are well thought through and researched in the book (by a lawyer who is technically proficient Andreas M. Antonopoulos is her CTO)

e.g.

• Do we also need to store identities of the other shardholders? Dan once mentioned a security mechanism whereby shardholders do not know each others identities and then broadcast their identity in the case of a certain condition (the secret being lost). I would ideally like not to store them with the shard.

• people receiving secret shard are unaware of everyone involved, to include more, just add to recps. @Grace can choose to make everyone in the group hidden of visible to the others, or just make it so only one other person knows, or just themselves.

• i'm keen to go super simple with our v1
  I tihnk if I've understood everyones suggestions the main things to decide are :
  do I record who I sent shards to onchain (I think yes)