cloudhead/nakamoto

Support service bit filtering

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#50 opened on Sep 18, 2021

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good first issuehelp wanted

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Description

To have a higher chance to connect to peers with NODE_COMPACT_FILTERS support, we could use the service bit filtering functionality of DNS seeds.

This is not a very well documented feature, but there is some information here: https://bitcoin.stackexchange.com/questions/60373/dns-seeder-options

The filter we'd be interested in is NODE_NETWORK | NODE_COMPACT_FILTERS, so 1 << 0 | 1 << 6 = 65.

Since not all seeds support this functionality, we should fall back on a regular DNS query if we're unable to retrieve addresses from the seeds.

Contributor guide

Research direction
Investigate DNS seed query format for service bit filtering, implement a query with the desired service bits (65 for NODE NETWORK | NODE COMPACT FILTERS), and add fallback to regular DNS query if filtering is not supported.
Tech stack
rust
Domain
networkingblockchain
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
RustBitcoin networking
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50