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Guide - Add LLMQ signing session data flow draft

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thephez 2019-04-22 15:11:16 -04:00
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@ -709,14 +709,29 @@ the Intra-Quorum communication process described in the DIP.
{% endautocrossref %}
##### LLMQ Signing
##### LLMQ Signing Session
<!-- no subhead-links here -->
The following table details the data flow of P2P messages exchanged during
an LLMQ signing session. These sessions take advantage of BLS threshold signatures
to enable quorums to sign arbitrary messages. For example, Dash Core 0.14 uses
this capability to create the quorum signature found in the `clsig` message that
enables ChainLocks.
Please read [DIP7 LLMQ Signing Requests / Sessions](https://github.com/dashpay/dips/blob/master/dip-0007.md)
for additional details.
*LLMQ Signing Session Data Flow*
| **Masternode** | **Direction** | **Peers** | **Description** |
| **[Siging Request Phase](https://github.com/dashpay/dips/blob/master/dip-0007.md#signing-request)** | | | Request quorum signing of a message (e.g. InstantSend transaction input) (intra-quorum communication) |
| `qsigsesann` message | → | | Masternode sends a signing session announcement _to other masternodes in the quorum_
| **[Share Propagation Phase](https://github.com/dashpay/dips/blob/master/dip-0007.md#propagating-signature-shares)** | | | Members exchange signature shares within the quorum (intra-quorum communication) |
| `qsigsinv` message | → | | Masternode sends one or more quorum signature share inventories _to other masternodes in the quorum_<br>_May occur multiple times in this phase_
| | ← | `qgetsigs` message (qcontrib) | Peer(s) respond with request for signature shares<br>_May occur multiple times in this phase_
| `qbsigs` message | → | | Masternode sends the requested batched signature share(s)<br>_May occur multiple times in this phase_
| **[Threshold Signature Recovery Phase](https://github.com/dashpay/dips/blob/master/dip-0007.md#recovered-threshold-signatures)** | | | A recovered signature is created by a quorum member once valid signature shares from at least the threshold number of members have been received |
| `qsigrec` message | → | | Masternode sends the quorum recovered signature **to all peers** (except those that have asked to be excluded via a `qsendrecsigs` message)
#### Quorum Selection
{% include helpers/subhead-links.md %}