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typo: TH/s should be TH

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The unit of measurement is TH, not TH/s.

The total number of bits you can use for the nonce is: 16 bits from versionbits, plus 32 bits from the standard nonce field, for a total of 281 TH. This number does not measure a rate, but the total space the hashing process can browse with that number of nonce bits.

2^(16+32) == 281 TH
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ch12_mining.adoc
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@ -1297,7 +1297,7 @@ modify the timestamp.
Another solution widely used today is to use up to 16 bits of the block
header versionbits field for mining, as described in BIP320. If each
piece of mining equipment has its own coinbase transaction, this allows
an individual piece of mining equipment to perform up to 281 TH/s by
an individual piece of mining equipment to perform up to 281 TH by
only making changes to the block header. This keeps mining equipment
and protocols simpler than incrementing the extra nonce in the coinbase
transaction every 4 billion hashes, which requires recalculating the