3 seconds is the standard block production time of the GRANDPA/BABE consensus of the Relay Chain.
For example, using an average Month (with 30 days) and the above mentioned 3 seconds interval, the Counter Node would combine 864000 timestamps x wallet into a detailed on-chain copy of the exchange's ledger of that month's activity.
The condition specifies "at least equal" for a specific reason: the retainer wallet (see graph above). This wallet represents the sum of costs of operations, tax and retained earnings (the "gross" part of revenues generated that is subtracted to operate and expand the exchange).Particularly, retained earnings is the only Company "managed" allocation within our systems, and is used to create a liquid economic cushion to cover a variety of needs, from volatile changes in the market, to increases in costs and expansions, and more.What this boils down to is that 9 out of 10 times, the actual amount distributed in any "current" period will actually be larger than the "expectation" because non-spent cost allocations or exceeding retained earnings are fed back into the system and added on top of the expectation.
Provable finality means definitive and irreversible entries in a blockchain ledger.