validator-proposal.bob

                                 .------------.
                                 | Upstream   |
                                 | Validators |
                                 `----+-------`
                                      |
                                      |
             .-----------------------------------.
             | Validator              |          |
             |                        v          |
             |  .-----------.    .------------.  |
 .--------.  |  | Fetch     |    | Repair     |  |
 | Client +---->| Stage     |    | Stage      |  |
 `--------`  |  `---+-------`    `----+-------`  |
             |      |                 |          |
             |      v                 v          |
             |  .-----------.    .------------.  |
             |  | TPU       |<-->| Blockstore |  |
             |  |           |    |            |  |
             |  `-----------`    `----+-------`  |
             |                        |          |
             |                        v          |
             |                   .------------.  |
             |                   | Multicast  |  |
             |                   | Stage      |  |
             |                   `----+-------`  |
             |                        |          |
             `-----------------------------------`
                                      |
                                      v
                                 .------------.
                                 | Downstream |
                                 | Validators |
                                 `------------`



                                 .------------.
                                 | PoH        |
                                 | Service    |
                                 `-------+----`
                                     ^   |
                                     |   |
             .-----------------------------------.
             | TPU                   |   |       |
             |                       |   v       |
  .-------.  |  .-----------.    .---+--------.  |  .------------.
  | Fetch +---->| SigVerify +--->| Banking    |<--->| Blockstore |
  | Stage |  |  | Stage     |    | Stage      |  |  |            |
  `-------`  |  `-----------`    `-----+------`  |  `------------`
             |                         |         |
             |                         |         |
             `-----------------------------------`
                                       |
                                       v
                                 .------------.
                                 | Banktree   |
                                 |            |
                                 `------------`