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So, 1 GHash equals 1000 Mhash's as far as I know. Then, why genesis-mining measures the bitcoin hashpower in terrahashes?? 1 Thash = 1000 Ghash. The whole hashocean is said to have 41.6 GH/s. On genesis you can buy 1 Thash for 400$. Who is naming their units in incorrect way?
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Your 41.6 GH/s is certainly wrong. According to https://bitcoinwisdom.com/bitcoin/difficulty it's currently 757,561,871 GH/s = 757,561 TeraHash/s.
Also: it's "Tera", one r and capital T. Capitalization is important in the Metric prefixes. https://en.wikipedia.org/wiki/Metric_prefix
Note also that cloud mining is usually a scam. Why would they give you money? Answer: they don't.
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As the network gets bigger, the reference hashpower for the whole network grows too. The bitcoin network is now in the petahash range and soon will be exahashes!
1000 k kilo
1000^2 M mega
1000^3 G giga
1000^4 T tera
1000^5 P peta
1000^6 E exa
1000^7 Z zetta
1000^8 Y yotta
related: https://bitcoin.stackexchange.com/q/9219/5406
– Murch – 2018-10-04T02:01:24.023