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Merge bitcoin/bitcoin#33199: fees: enable CBlockPolicyEstimator return sub 1 sat/vb fee rate estimates

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8966352df3 doc: add release notes (ismaelsadeeq)
704a09fe71 test: ensure fee estimator provide fee rate estimate < 1 s/vb (ismaelsadeeq)
243e48cf49 fees: delete unused dummy field (ismaelsadeeq)
fc4fbda42a fees: bump fees file version (ismaelsadeeq)
b54dedcc85 fees: reduce `MIN_BUCKET_FEERATE` to 100 (ismaelsadeeq)

Pull request description:

  This is a simple PR that updates the block policy estimator’s `MIN_BUCKET_FEERATE` constant to be 100, which is identical to the policy `DEFAULT_MIN_RELAY_TX_FEE`.

  This change enables the block policy fee rate estimator to return sub-1 sat/vB fee rate estimates.

  The change is correct because the estimator creates buckets of fee rates from
  `MIN_BUCKET_FEERATE`,
  `MIN_BUCKET_FEERATE` + `FEE_SPACING`,
  `MIN_BUCKET_FEERATE` + `2 * FEE_SPACING`,
  … up to `MAX_BUCKET_FEERATE`.

  This means it will record sub-1 sat/vB fee rates in the buckets and may return them as a fee rate estimate when that bucket is the lowest one with sufficient transactions for a given target.

  ---

  While touching this part of the fee estimator code, this PR got rid of the dummy value persisted in the file

ACKs for top commit:
  achow101:
    ACK 8966352df3
  musaHaruna:
    ACK [8966352](8966352df3)
  polespinasa:
    ACK 8966352df3

Tree-SHA512: 9424e0820fcbe124adf5e5d9101a8a2983ba802887101875b2d1856d700c8b563d7a6f6ca3e3db29cb939f786719603aadbf5480d59d55d0951ed1c0caa49868
This commit is contained in:
Ava Chow
2026-02-19 11:41:34 -08:00
parent 37e449dcc7 8966352df3
commit d0998cbe34
4 changed files with 68 additions and 35 deletions
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9
doc/release-notes-33199.md Normal file
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Fee Estimation
========================
- The Bitcoin Core fee estimator minimum fee rate bucket was updated from **1 sat/vB** to **0.1 sat/vB**,
which matches the node’s default `minrelayfee`.
This means that for a given confirmation target, if a sub-1 sat/vB fee rate bucket is the minimum tracked
with sufficient data, its average value will be returned as the fee rate estimate.
- Note: Restarting a node with this change invalidates previously saved estimates in `fee_estimates.dat`, the fee estimator will start tracking fresh stats.