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Kadena_NiceHash_v1.0.txt
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Kadena_NiceHash_v1.0.txt
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-------------------------------------------------------------------------
NiceHash presents
=========================================================================
Kadena mining protocol modification v1.0
=========================================================================
I. Introduction & Concept
II. Specifications (RFC)
III. Contact
I. Introduction & Concept
-------------------------
This specification is placing additional restriction for nonce length and
job frequency provided by pools.
II. Specifications (RFC)
-------------------------
a. Subscribe response
In "mining.subscribe" pool provides fixed "nonceprefix" miners should use when generating
randomness.
Example:
-> subscribe
{
"id": 1,
"method": "mining.subscribe",
"params": [
"NiceHash/1.0.0"
]
}
<- response
{
"id": 1,
"result": [
null,
"a331",
6
],
"error": null
}
Response provides nonceprefix "a331" which is 2 bytes long. To prevent duplicate shares
and properly distribute work load, NiceHash adds additional byte for the miners, which
sets nonceprefix to 3 bytes.
b. Nonceprefix
Since nonce is 64 bit (8 bytes) wide and considering very bad possible scenario, that miner
does not find a block in 1.5 seconds time, 8 bytes of nonce can support miner with speed of up to:
( 2^64 / 1.5 ) / 1T ~= 12'297'829.38 TH/s
This is a very big number so we can easily consider taking some bytes off for our stratum protocol.
---------------------------------------
| Bytes | Max supported hashing speed |
| 8 | ~12'297'829.38 TH/s |
| 7 | ~48'038.39 TH/s |
| 6 | ~187.64 TH/s |
| 5 | ~0.73 TH/s |
---------------------------------------
Having only 6 bytes for nonce is not an option, since we have ASICs capable of reaching 100 TH/s and more.
Allowed nonceprefix provided by the pool is 0 to 1 bytes, with additional constraint that jobs must be
sent at least once per second.
III. Contact
-----------
www.nicehash.com