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What is a block-relay-only connection? What is it used for?

Started by Bitcoin, Mar 11, 2022, 07:45 pm

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Bitcoin

What is a block-relay-only connection? What is it used for?

Modern versions of bitcoin core establish a fixed number of outbound connections: 8 outbound-full-relay connections and 2 block-relay-only connections. What is the purpose of block-relay-only connections and how are they used?


Here are two example log entries of a node establishing these connections:


2022-03-10T14:50:36Z New outbound peer connected: version: 70015, blocks=726709, peer=1566 (outbound-full-relay)
2022-03-10T14:55:28Z New outbound peer connected: version: 70016, blocks=726710, peer=1576 (block-relay-only)

Here is an example CLI query showing all connected peers:


$ bitcoin-cli -netinfo
Bitcoin Core v22.0.0 - 70016/Satoshi:22.0.0/

            ipv4    ipv6   onion   total   block  manual
    in         0       0      24      24
    out        2       0       9      11       2       1
    total      2       0      33      35

Local addresses
REDACTED     port   8333    score      4

Note: this node has one addnode entry in its bitcoin.conf file. Nodes connected to in this fashion do not count against the 8 and 2 outbound connection limits so this adds an additional 11th outbound peer.


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