The hand is an space to storage cards that only the player/owner can see. Every board is created with one hand (Main Hand) that can be enabled or disabled.
When cards are put in the hand, cards can overlap depending on the atributes of the deck they belong. Overlap depends on the atributes of the card on the left, the overlap do not depends on the card overlaping.
It is possible to create more than one hand. Extra Hands do not apply overlap and you can freely arrange cards in the way you want. this can be used to create extra space on screen. If you use pieces that dont need alignment, a second hand is ideal.
As it seens what defines the Main Hand is that it has the "id":"hand" therefore there can oly be one main hand per board.
It is possible to only have Extra Hands on a board. No extra hand can have "hand" as id
This is the hand that comes with every boards (Main Hand)
{"id":"hand","type":"hand","x":50,"y":820,"z":1,"enabled":true,"dragging":null}
and this is how it looks
A hand has the following atributes: