Minecraft wiki entry for Sand, associated text: Dynamic block entity data
Tags common to all entities[show]
 BlockState: The falling block represented by this entity.
 Name: The resource location of the block.
 Properties: Optional. The block states of the block.
 Name: The block state name and its value.
 DropItem: 1 or 0 (true/false) – true if the block should drop as an item when it breaks. Any block that does not have an item form with the same ID as the block does not drop even if this is set.
 FallHurtAmount: Multiplied by the FallDistance to calculate the amount of damage to inflict. By default this value is always 2.
 FallHurtMax: The maximum hit points of damage to inflict on entities that intersect this falling block. For vanilla falling blocks, always 40 × 20.
 HurtEntities: 1 or 0 (true/false) – true if the block should hurt entities it falls on.
 TileEntityData: Optional. The tags of the block entity for this block.
 Time: The number of ticks the entity has existed. When Time goes above 600, or above 100 while the block is below Y=1 or is outside building height, the entity is deleted.