Coin Metrics corrected more than 19 months of Bitcoin ETF-related on-chain data, leaving users of its identified-wallet series to reassess any analysis built on the affected history.
The Sept. 22 status notice says the correction covers Bitcoin data from Feb. 7, 2025 through Sept. 17, 2026. Coin Metrics listed 35 affected daily series and 25 hourly series, including ETF deposits, withdrawals, transfer counts and transactions. The daily list also included net-flow and supply measures.
These are provider-derived observations of activity involving blockchain addresses Coin Metrics identifies as ETF-owned, rather than official ETF share-creation, redemption or fund-accounting records.
The notice does not state what caused the recalculation. Moreover, it gives no before-and-after values, aggregate difference or percentage change; does not say whether the revisions generally raised or lowered the figures; and does not identify the largest adjustment or any affected research.
What the correction can change
Coin Metrics' deposit methodology defines an ETF deposit as assets sent during an interval to an address the company identifies as ETF-owned. Dollar-denominated deposit flows are calculated from native-unit flows using its PriceUSD metric.
Its withdrawal methodology counts assets leaving the control of identified ETF addresses. For Bitcoin withdrawals, Coin Metrics excludes the effect of change outputs, so coins returned to the same fund cluster are not counted as a separate inflow.
Coverage is another constraint. Coin Metrics says its ETF transaction-count metric includes only ETFs and addresses it has identified, making that specific metric a minimum potential value. The daily correction list also reaches its ETF supply series.
Wallet movements cannot be treated as a one-to-one proxy for authorized-participant creations or redemptions. Coin Metrics measures attributed blockchain activity, while the regulated fund process concerns orders for ETF shares, including the in-kind mechanism permitted under the SEC's July 2025 approval. The Sept. 22 notice describes a correction to Coin Metrics Network Data, not a revision to issuer records.
The practical impact is therefore limited to work that used the affected Coin Metrics series. Anyone who stored those daily or hourly values, or used them in models, charts or research covering the corrected interval, may need to backfill the history and rerun that work. The notice does not show that unrelated ETF analysis changed.
Until Coin Metrics publishes deltas or a fuller explanation, the responsible conclusion remains narrow: the provider changed a broad slice of its ETF-wallet picture, but has not shown the public how much that picture moved.
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