Stratum protocol extensions

1. Mining algorithm negotiation

Subset of protocol extensions, used to negotiate algorithm between miner and pool/proxy. All extensions is backward compatible with standart stratum protocol.

1.1. Miner defined algorithms list

Miner should send list of algorithms supported. Multiple algorithms in list meant miner can switch algorithms in runtime.

{
  "id": 1, "jsonrpc": "2.0", "method": "login",
  "params": {
    "login": "...", "pass": "...", "agent": "...",
    "algo": ["cn", "cn/0", "cn/1", "cn/xtl"]
  }
}

In case if miner not support dynamic algorithm change, miner should send list with one item, for example "algo": ["cn-heavy"], pool/proxy should provide work for selected algorithm or send error.

1.2. Extended job object

To each job object pool/proxy should add additional field algo and optional variant field.

{
  "id": 1, "jsonrpc": "2.0", "error": null,
  "result": {
    "id": "...",
    "job": {
      "blob": "...", "job_id": "...", "target": "...", "id": "...",
      "algo": "cn/1", "variant": 1
    },
    "status": "OK"
  }
}

{
  "jsonrpc": "2.0", "method": "job",
  "params": {
    "blob": "...", "job_id": "...", "target": "b88d0600", "id": "...",
    "algo": "cn/1"
  }
}

Possible values for variant:

1 Force use variant 1 of algorithm.
0 Force use original cn/cn-lite algorithm.

This field used for backward compatibility with xmrig 2.5, new miner implementations should support only algo.

If miner not support algorithm connection should be closed by miner to initiate switch to backup pool.

1.3. Algo extension

This extension is backward compatible with xmr-stak extended mining statistics. First, pool should add algo to extensions list:

{
  "id": 1, "jsonrpc": "2.0", "error": null,
  "result": {
    "id": "...",
    "job": {
      "blob": "...", "job_id": "...", "target": "...", "id": "...",
      "algo": "cn", "variant": 1
    },
    "extensions" : ["algo"],
    "status": "OK"
  }
}

Second, miner add fields algo to submit request.

{
  "id": 2, "jsonrpc": "2.0", "method": "submit",
  "params": {
    "id": "...", "job_id": "...", "nonce": "...", "result": "...",
    "algo": "cn/1"
  }
}

Note about xmr-stak, this miner use different algorithm names.

1.4 Algorithm names and variants

Both miner and pool should support short algorithm name aliases:

Long name	Short name	Variant	Notes
`cryptonight`	`cn`	`-1`	Autodetect works only for Monero.
`cryptonight/0`	`cn/0`	`0`	Original/old CryptoNight.
`cryptonight/1`	`cn/1`	`1`	Also known as `monero7` and `CryptoNightV7`.
`cryptonight/2`	`cn/2`	`2`	CryptoNight variant 2.
`cryptonight/xtl`	`cn/xtl`	`"xtl"`	Stellite (XTL).
`cryptonight/msr`	`cn/msr`	`"msr"`	Masari (MSR), also known as `cryptonight-fast`.
`cryptonight/xao`	`cn/xao`	`"xao"`	Alloy (XAO)
`cryptonight/rto`	`cn/rto`	`"rto"`	Arto (RTO)
`cryptonight/half`	`cn/half`	`"half"`	CryptoNight variant 2 with half iterations.
`cryptonight/gpu`	`cn/gpu`	`"gpu"`	CryptoNight-GPU (RYO).
`cryptonight/wow`	`cn/wow`	`"wow"`	CryptoNightR (Wownero).
`cryptonight/r`	`cn/r`	`"r"`	CryptoNightR (Monero's variant 4).
`cryptonight/rwz`	`cn/rwz`	`"rwz"`	CryptoNight variant 2 "ReverseWaltz" (Graft).
`cryptonight/zls`	`cn/zls`	`"zls"`	CryptoNight variant 2 with 3/4 iterations (Zelerius).
`cryptonight/double`	`cn/double`	`"double"`	CryptoNight variant 2 with double iterations (X-CASH).
`cryptonight-lite`	`cn-lite`	`-1`	Autodetect works only for Aeon.
`cryptonight-lite/0`	`cn-lite/0`	`0`	Original/old CryptoNight-Lite.
`cryptonight-lite/1`	`cn-lite/1`	`1`	Also known as `aeon7`
`cryptonight-lite/ipbc`	`cn-lite/ipbc`	`"ipbc"`	IPBC variant, obsolete
`cryptonight-heavy`	`cn-heavy`	`0`	Ryo and Loki
`cryptonight-heavy/xhv`	`cn-heavy/xhv`	`"xhv"`	Haven Protocol
`cryptonight-heavy/tube`	`cn-heavy/tube`	`"tube"`	BitTube (TUBE)
`cryptonight-pico/trtl`	`cn-pico/trtl`	`"trtl"`	TurtleCoin (TRTL)

Proper pool/proxy implementation should avoid any automatic/autodetect variants, variant must explicitly specified.

1.5 XMR-Stak algorithm names

Mapping between XMR-Stak algorithm names and XMRig names.

XMR-Stak name	XMRig Short name
`cryptonight`	`cn/0`
`cryptonight-monerov7`	`cn/1`
`cryptonight_v7`	`cn/1`
`cryptonight_v7_stellite`	`cn/xtl`
`cryptonight_masari`	`cn/msr`
`cryptonight_lite`	`cn-lite/0`
`cryptonight-aeonv7`	`cn-lite/1`
`cryptonight_lite_v7`	`cn-lite/1`
`cryptonight_lite_v7_xor`	`cn-lite/ipbc`
`cryptonight_heavy`	`cn-heavy`
`cryptonight_haven`	`cn-heavy/xhv`

Rig identifier

User defined rig identifier. Optional field rigid in login request. More details: https://github.com/fireice-uk/xmr-stak/issues/849

Extended mining statistics

More details: https://github.com/fireice-uk/xmr-stak/issues/66

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