D * 2**256 / (0xffff * 2**208)
Yeah, the meaning is the same.
An excellent approximation for calculating BTC per Gh per day while the block reward is 25 BTC is simply 502906 / Difficulty.
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Reward = hash rate * block reward * time period / (2^32 * difficulty)
block reward / (difficulty * 2^32 / hash rate / time period)
25 / (40007470271 * 2^32 / 10^9 / 86400) = 0.00001257
BTC earned per day = Block Reward / (Difficulty * 2**32 / hash rate / seconds in a day)
40007470271 * 2^32 / 1000000000000 / 86400 = 1988.78 days
25 / 1988.78 = 0.01257052
BTC earned per day = Block Reward / (Difficulty * 2**32 / hash rate / seconds in a day)
mining start date:
Difficulty
Hash Rate / GHsec^-1
BTC / hour
days at this difficulty
hours at this difficulty
Total BTC at this difficulty
=NOW()
18736441558
29650
=25/((B2/(B3*1000000000))*2^32/3600)
=6.8/24
=B5*24
=B4*B6
=B1+B5
=B2*(1+0.1)
=B3
=25/((C2/(C3*1000000000))*2^32/3600)
13
=C5*24
=C4*C6
mining start date:
Difficulty
Hash Rate / GHsec^-1
BTC / hour
days at this difficulty
hours at this difficulty
Total BTC at this difficulty
=NOW()
18736441558
29650
=25/((B2/(B3*1000000000))*2^32/3600)
=6.8/24
=B5*24
=B4*B6
=B1+B5
=B2*(1+0.1)
=B3
=25/((C2/(C3*1000000000))*2^32/3600)
13
=C5*24
=C4*C6
25 / (18736441558 * 2**32 / 29650000000000 / 86400) = 0.79585047[btc] per day