Nicehash / Hashrate rental compatibility

[dh35]

Environment Devices: Nicehash rental dashboard

Steps to Reproduce

1. Have ASICseer ops connect Nicehash accounts to pool and verify compatibility
2. Mine working shares with Nicehash on [ASICseer BCH pool]

Expected Result Miners are able to rent hashrate from Nicehash (or similar rental platforms) with full compatibility and without a massive negative delta (rejects).

Pool software should give nicehash the correct starting stratum difficulty (>500,000) to allow connection, and nicehash difficulty must always remain >500,000 or Nicehash will cancel order. Vardiff is okay, but vardiff floor for nicehash must be 500,001.

[tfaoro]

A potential solution here would be rework the "trusted" and "serverurl" config options to each have their own independent mindiff, startdiff, and maxdiff. You can already configure multiple ports on a single instance, so doing this would allow each port to have different diff parameters. For example:

Current config:

{
"trusted" : [
      "0.0.0.0:3334"
],
"mindiff" : 500001,
"startdiff" : 750000,
"maxdiff" : 0,
}

Proposed config:

"trusted" : [
{
   "name": "standard",
   "mindiff": "50",
   "startdiff": "50000",
   "maxdiff": "0",
   "bind": "0.0.0.0:3333"
},
{
   "name": "nicehash",
   "mindiff": "500001",
   "startdiff": "750000",
   "maxdiff": "0",
   "bind": "0.0.0.0:3334"
}
]

[cculianu]

We went with the mindiff_overrides approach as discussed in Telegram. See #13 .

This should be fixed now by #13. We will wait for more tests and then close this issue after 100% confirmation that it's running as intended.

[dh35]

Working as intended.