The primordial miniflow action is the unique well-formed action which consumes its own output and emits (0,0).
Block 0 has 1 action: Action 0 has 1 input and creates 2 spendable outputs (out of 3 total outputs): * Input 0 consumes output 0 of 0th action itself. - Output 0 emits emits (0,0), which is the output consumed by input 0. + Output 1 emits (0,1) + Output 2 emits [1-2^256-1].
Note that a reference to output 0 is also a reference to the primordial output under null-point hash, since
actionHash == 0 means “this action”.
In other words, the null point simultaneously comes into existence and separates into abstract and concrete spaces by double spending itself.
The outputs of block 0 have no conditions (they are anyone-can-spend), so 1st block’s producer can consume (0,1) and [1,2^256-1].