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| ## 11 Proxies | ||
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| Proxies are entities that aggregate hashrate from multiple Mining Devices into a single Connection. | ||
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| The following protocol primitives are based on the assumption that proxies are part of the infrastructure: | ||
| - Extended Extranonces: allowing for efficient hashing space distribution. | ||
| - Future Jobs: allowing for in-site caching of Future Jobs (therefore avoiding empty Jobs). | ||
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| Proxies can be nested into multiple layers, depending on different needs for miner infrastructure. | ||
| The infrastructure complexity may vary according to operational requirements, but a single proxy layer should suffice for most simple setups. | ||
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| Proxies can be split in two main categories: | ||
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| ### 11.1 Mining Proxy | ||
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| TODO: review correctness of this | ||
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| A Mining Proxy covers the full scope of the Mining Protocol. It supports all types of channels, both for Upstream and Downstream Connections. | ||
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| | | **Standard Channels** | **Group Channels** | **Extended Channels** | | ||
| |----------------|-----------------------|--------------------|-----------------------| | ||
| | **Upstream** | yes | yes | yes | | ||
| | **Downstream** | yes | yes | yes | | ||
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| A Mining Proxy is responsible for delivering Jobs to Downstream Channels and is a crucial piece of infrastructure for optimizing the hash space distribution across multiple SV2 Mining Devices (plus SV1 Mining Devices, in case a Translator Proxy is available Downstream). | ||
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| A Mining Proxy can forward multiple Standard Channels to the Upstream, ideally one representing each SV2 Mining Device Downstream. | ||
| The Upstream (Pool, JDC or another Mining Proxy) is expected to send a `SetGroupChannel` message aggregating different Standard Channels. | ||
| The Upstream sends jobs via `NewExtendedMiningJob` to Group Channels, and if some Downstream is a Mining Device (i.e.: the `SetupConnection` had the `REQUIRES_STANDARD_JOBS` flag) the Mining Proxy converts that message into different `NewMiningJob` messages after calculating the correct Merkle Root based on each Standard Channel's `extranonce_prefix`. | ||
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| Alternatively, a Mining Proxy could aggregate multiple Donwstream Standard Channels into a single Extended Channel. The Upstream sends Jobs via `NewExtendedMiningJob`, and for each Downstream SV2 Mining Device, the Mining Proxy sends different `NewMiningJob` message, where the Merkle Root is based on the Standard Channel's `extranonce_prefix`. | ||
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|  | ||
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| ### 11.2 Translator Proxy | ||
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| A Translator Proxy has a much more limited scope of functionality, when compared to a Mining Proxy. | ||
| It can only open Extended Channels with its Upstream, and all its Downstream Connections are SV1. | ||
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| Its main purpose is to allow legacy SV1 Mining Devices to be deployed within SV2 infrastructures. | ||
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| | | **Standard Channels** | **Group Channels** | **Extended Channels** | | ||
| |----------------|-----------------------|--------------------|-----------------------| | ||
| | **Upstream** | no | no | yes | | ||
| | **Downstream** | no (SV1) | no (SV1) | no (SV1) | | ||
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| A Translator Proxy establishes SV1 connections with its Downstream SV1 Mining Devices, and establishes `extranonce_size` and a unique `extranonce_prefix` for each one of them via the `mining.set_extranonce` SV1 message. | ||
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| It receives Extended Jobs from the Upstream via `NewExtendedMiningJob` messages. For each Downstream SV1 Mining Device, a `mining.notify` SV1 message is sent, and the SV1 Mining Devices are expected to calculate their own Merkle Roots while rolling over their assigned Extranonce space. | ||
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