LND Tests A Guardrail Against Extreme External Bitcoin Fee Estimates

LND’s October 22 release candidate brings attention to a quiet source of wallet risk: outside fee estimates that software treats too generously. The 0.21.5 development notes describe a ceiling for values received through an external fee API, alongside fixes to other node operations. TL;DR The published build is v0.21.5-beta.rc1, a pre-release. The fee change limits extreme estimates supplied by an external service. Release verification and application testing answer different questions. A remote estimate needs limits before it reaches the wallet The release notes say external estimates previously had a lower bound without the corresponding upper bound. The documented repair limits the estimate before it can flow into fee-sensitive wallet operations. The associated change applies a ceiling of 10,000 satoshis per virtual byte and also bounds the API’s minimum-relay estimate. That ceiling is an extreme-value guardrail. It is not a statement that such a fee is normal, economical or required by current network conditions. A fee estimate is an input to a decision, not an instruction that must be obeyed at any cost. A service can return an unusable value because of an error, a changed dat...