Bitcoin Core 0.20 asmap guide covering experimental ASN mapping, peer bucketing, map provenance and freshness, mapped_as evidence, failure modes and rollback.
This guide explains Bitcoin Core asmap in plain English. It focuses on what the subject is, why it matters and what a beginner should remember.
Bitcoin Core asmap: Diverse peer buckets make eclipse-style concentration harder when addresses controlled through related networks would otherwise appear separate.
A node operator is checking Bitcoin Core asmap. Define the attacker and connectivity assumptions before claiming benefit. The 0.20 release explicitly called asmap experimental and subject to removal or breaking changes.
Diverse peer buckets make eclipse-style concentration harder when addresses controlled through related networks would otherwise appear separate. Define the attacker and connectivity assumptions before claiming benefit.
The 0.20 release explicitly called asmap experimental and subject to removal or breaking changes. Pin the Core version, file format and startup behaviour.
Build or get the map from a documented routing-data source, verify its hash and creation time and transfer it as configuration evidence. An untrusted map can manipulate bucketing.
ASN allocations and announcements change. Establish an update cadence and compare material mapping shifts, but avoid replacing a known map automatically without validation.
getpeerinfo added mapped_as to show the chosen mapping. Review outbound-peer distribution alongside address family, direction and reachability; mapped_as alone is not a health score.
Test missing, unreadable, malformed, empty and stale files and verify whether startup fails or falls back for the exact version. Alert on unexpected legacy mapping rather than silently continuing.
Developers test the proposal with made-up data on an isolated test network. They check normal cases and deliberately invalid cases. Different implementations should reach the same result before anyone relies on the proposal.
Bitcoin Core asmap: Diverse peer buckets make eclipse-style concentration harder when addresses controlled through related networks would otherwise appear separate.
Diverse peer buckets make eclipse-style concentration harder when addresses controlled through related networks would otherwise appear separate.
The 0.20 release explicitly called asmap experimental and subject to removal or breaking changes.
Build or get the map from a documented routing-data source, verify its hash and creation time and transfer it as configuration evidence.
Bitcoin Core can improve address-manager bucketing when its routing map is authentic and maintained. It remains defence in depth, so operators must monitor actual peer diversity and preserve a tested fallback.
Check the current specification status and the documentation for the exact implementation you operate before moving production funds or changing a mining node.
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