PoS on BC

From the source:

int64 nSubsidy = nCoinAge * COIN_YEAR_REWARD * 33 / (365 * 33 + 8 );

nCoinAge is days.  For the age of your coin you get 1% * coinage / days in a year.



So to put in numbers.

You have 100,000 coins that are all 8 hours old and generate a stake.  You get 100000 * .01 * .33 / 365 =  0.904109.
You now have 100000.904109

Next time you wait 5 days before you generate a stake.

100000.904109 * .01 * 5 / 365 = 13.69875
Now you have  100014.602859

Next time you wait 90 days
100014.602859 * .01 * 90 / 365  = 246 .611348
Now you have 100261.214207

Next time you wait the rest of the year
100261.214207 * 0.01 * 269.66 /365 = 740.724356
Now you have 101001.938563

Or just a bit over 1% annually.

This will always come out to a bit over 1% annually because the coin age continues to grow until the coins stake.  The period they will actually stake is random, but irrelevant because the reward uses coin age.