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143 lines
4.3 KiB
143 lines
4.3 KiB
# Stratum mode self-select
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One major concern of pool mining has been that of pool centralization. A
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malicious pool operator, controlling a pool with a significant portion of the
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total network hash-rate (e.g. 51% or more), has the ability to perform various
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attacks. This is made possible due to the fact miners have no visibility into
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what block template they are actually mining on. This leads to another concern -
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censorship of transactions. Again, as miners have no visibility of the block
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template they are mining, they also have no visibility of the transactions
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included in the block template. This enables a malicious pool be selective as to
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which transactions get included (or not) into a block.
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To address these concerns, I've implemented an optional *mode* for this pool,
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which enables miners to select their *own* block template to mine on.
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Along with this pool, the popular miner [XMRig](https://github.com/xmrig/xmrig)
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has this mode implemented. There is also a very simple [demonstration
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miner](https://github.com/jtgrassie/monero-powpy/blob/master/stratum-ss-miner.py)
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in the [monero-powpy](https://github.com/jtgrassie/monero-powpy) project which
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can be used to augment this document for implementers.
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## Specification
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What follows are the stratum message and flow changes required to enable pool
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miners to mine on miner created block templates.
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(1) The miner logs into the pool with an additional *mode* parameter:
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{
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"method": "login",
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"params": {
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"login": "wallet address",
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"pass": "password",
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"agent": "user-agent/0.1",
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"mode": "self-select" /* new field */
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},
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"jsonrpc": "2.0",
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"id":1
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}
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(2) The pool responds with a result job which includes the pool wallet address
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and an extra nonce:
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{
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"result": {
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"job": {
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"pool_wallet": "pool wallet address", /* new field */
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"extra_nonce": "extra nonce hex", /* new field */
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"target": "target hex",
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"job_id": "job id"
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},
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"id": "client id",
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"status": "OK"
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},
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"jsonrpc": "2.0",
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"id":1
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}
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(3) The miner can now call a local, or remote, Monero daemons RPC method
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[get_block_template](https://getmonero.org/resources/developer-guides/daemon-rpc.html#get_block_template)
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with parameters `extra_nonce: "<extra nonce hex>"` (implemented in pull request
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[#5728](https://github.com/monero-project/monero/pull/5728)) and
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`wallet_address: "<pool wallet address>"`, using the result values from step #2
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above.
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The miner now informs the pool of the resulting block template it will use for
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the job:
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{
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"method":"block_template", /* new method */
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"params": {
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"id": "client id",
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"job_id": "job id",
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"blob": "block template hex",
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"height": N,
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"difficulty": N,
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"prev_hash": "prev hash hex"
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},
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"jsonrpc": "2.0",
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"id":1
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}
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(4) The pool validates and caches the supplied block template and responds with
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a status:
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{
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"result": {
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"status": "OK",
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"error", null
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},
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"jsonrpc": "2.0",
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"id":1
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}
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The *degree* of validation required is at the discretion of the pool
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implementer. This pool simply ensures the supplied block template can be parsed
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as a Monero block and that the destination coinbase reward pays out to the pool
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wallet.
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(5) The miner submits results. No changes here:
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{
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"method":"submit",
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"params": {
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"id": "client id",
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"job_id": "job id",
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"nonce": "deadbeef",
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"result": "hash hex"
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},
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"jsonrpc": "2.0",
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"id":1
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}
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(6) The pool responds to job submissions. No changes here:
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{
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"result": {
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"status": "OK",
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"error", null
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},
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"jsonrpc": "2.0",
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"id":1
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}
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(7) The pool asks the miner to start a new job:
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{
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"method": "job",
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"params": {
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"pool_wallet": "pool wallet address", /* new field */
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"extra_nonce": "extra nonce hex", /* new field */
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"target": "target hex",
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"job_id": "job id"
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},
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"jsonrpc": "2.0",
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"id":1
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}
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The miner now repeats from step #3.
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[//]: # ( vim: set tw=80: )
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