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2.5 KiB
2.5 KiB
Channels
Each peer connection is multiplexed into channels.
PEX channel
The PEX channel is used to exchange peer addresses.
| Channel | "PEX" |
| Messages |
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Block channel
The block channel is used to propagate block or header information to new peers or peers catching up with the blockchain.
| Channel | "block" |
| Messages |
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| Notes | Nodes should only advertise having a header or block at height 'h' if it also has all the headers or blocks less than 'h'. Thus for each peer we need only keep track of two integers -- one for the most recent header height 'h_h' and one for the most recent block height 'h_b', where 'h_b' <= 'h_h'. |
Mempool channel
The mempool channel is used for broadcasting new transactions that haven't yet entered the blockchain. It uses a lossy bloom filter on either end, but with sufficient fanout and filter nonce updates every new block, all transactions will eventually reach every node.
| Channel | "mempool" |
| Messages |
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| Notes |
Instead of keeping a perfect inventory of what peers have, we use a lossy filter. Bloom filter (n:10k, p:0.02 -> k:6, m:10KB) Each peer's filter has a random nonce that scrambles the message hashes. The filter & nonce refreshes every new block. |
Consensus channel
The consensus channel broadcasts all information used in the rounds of the Tendermint consensus mechanism.
| Channel | "consensus" |
| Messages |
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| Notes | How do optimize/balance propagation speed & bandwidth utilization? |