Mirror
Who it’s for
Banks and trade-finance headsThe five-minute brief: what it does, what it refuses, what it costs, where it stands.Supervisors and FIUsThe macro ledger: corridor divergence, measured from signed verdicts.Examiners and auditorsOne signed record, and the checks you run with the network unplugged.EngineersThe operator API, the SDKs and the conformance vectors.Every documentThe protocol, procurement and operations library, in reading order.
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Corridor library · version 1, published 2026-09-27

5 corridor templates. No price in any of them.

For the goods trade-based laundering favours: what a corridor must band, which legs it must require, which must come from a party with no stake in the price, and what joins the legs. The pair brings the numbers and ratifies its own table; a template only checks its shape.

5 templates7 HS headings5 kinds of independent party0 prices, edges or tolerances
From template to corridorRead the JSON

The templates

What each corridor must see, and what it cannot.

Every template ends with its limits. A corridor built from one inherits them, and so does every clear it signs.

HS 7108

Gold — bullion, doré and semi-manufactured

Very high value for its weight, refinable into anything, and priced by a grade that the paperwork can misstate while the weight stays honest.

Bands
quantity · unit price · grade priced per g or kg
Legs required
invoicecustoms · independentpaymentinspection · independent
Why independent
  • inspection (assayer, inspectorate): Fineness is the price of gold. Only a measurement by a party with no stake in the price can say whether 999.9 was shipped or 750 dressed as it.
  • customs (customs): The one declaration of weight and value the traders do not control.
Grade scale
fineness, parts per thousand: 585 750 916 995 999hallmark standards (14, 18 and 22 karat, the 995 good-delivery minimum, fine gold) - grades, not prices
Legs join on
Bar serial and refiner · Air waybill · Bill of lading
Tolerance ceiling
at most 1 band either side
Edges come from
mirror-negotiate or pair-agreed never from Mirror
Reaches
Over-invoicing · Under-invoicing · Misdeclared goods / substitution · Multiple invoicing · Carousel / round-tripping
Runs on
mirror-dims mirror-assay mirror-customs mirror-concurrent-exposure mirror-independence
Cannot see
  • An assay measures the bars it tested, not every bar in the consignment.
  • Refining erases identity: a bar serial joins legs only until the bar is melted.
  • A mispricing inside one fineness band and one price band is invisible.
HS 8703

Used vehicles — passenger cars

Individually identifiable, widely financed, and valued across a range so wide that a false price rarely looks false on its own.

Bands
quantity · unit price priced per pieces
Legs required
invoicecustoms · independentpayment
Why independent
  • customs (customs): Export and import declarations of a vehicle are filed against its VIN by parties with no stake in the price.
Legs join on
VIN and export date · Bill of lading
Tolerance ceiling
at most 1 band either side
Edges come from
mirror-negotiate or pair-agreed never from Mirror
Reaches
Over-invoicing · Under-invoicing · Multiple invoicing · Phantom / short shipment · Related-party mispricing
Runs on
mirror-dims mirror-customs mirror-concurrent-exposure mirror-related
Cannot see
  • A VIN proves which vehicle, not its condition; condition moves price inside a band.
  • Dealer networks trade within one ownership group - related parties agree a price by construction, which is why the related-party check matters here.
  • A VIN key joins only exports on the same date; re-exports need their own date.
HS 8517

Mobile phones and telecom equipment

High value, small, fast-moving, and tradeable in circles: the same consignment can pass through a chain of companies and come back, each hop an invoice.

Bands
quantity · unit price priced per pieces
Legs required
invoicecustoms · independentpayment
Why independent
  • customs (customs): Declared quantity and value at the border, compared against the invoice the payment settles.
Legs join on
Container (ISO 6346) and voyage · Air waybill · Bill of lading · Tax e-invoice id
Tolerance ceiling
at most 1 band either side
Edges come from
mirror-negotiate or pair-agreed never from Mirror
Reaches
Over-invoicing · Under-invoicing · Carousel / round-tripping · Multiple invoicing · Phantom / short shipment
Runs on
mirror-dims mirror-customs mirror-einvoice mirror-cycle
Cannot see
  • Model and specification spread makes a unit-price band wide - finer edges per model family narrow it.
  • A carousel is visible only when enough of the chain's banks are on the rail to close the cycle.
  • A tax-registered e-invoice fixes an invoice in time; it does not verify its price.
HS 61HS 62

Textiles and apparel

Huge volumes of low-value lines, where quality and composition set the price and are easy to misdescribe - and a long history of re-invoicing through free zones.

Bands
quantity · unit price priced per pieces or kg
Legs required
invoicecustoms · independentpayment
Why independent
  • customs (customs): The classification and quantity declared at the border, independent of the traders' invoice.
Legs join on
Container (ISO 6346) and voyage · Bill of lading · Invoice composite · Tax e-invoice id
Tolerance ceiling
at most 1 band either side
Edges come from
mirror-negotiate or pair-agreed never from Mirror
Reaches
Over-invoicing · Under-invoicing · Misdeclared goods / substitution · Free-zone re-invoicing / transit manipulation
Runs on
mirror-dims mirror-customs mirror-chain mirror-einvoice
Cannot see
  • Quality and fibre composition inside one HS6 subheading are invisible without an inspection leg.
  • Each free-zone hop must be on the rail, or the chain is broken where it matters.
  • Pieces and kilograms are not comparable; a corridor ratifies one unit and refuses the other.
HS 7204HS 7404

Ferrous and copper scrap

Priced by a grade that is hard to verify and a weight that is easy to overstate, often shipped in bulk on voyages the documents describe loosely.

Bands
quantity · unit price · grade priced per kg or t
Legs required
invoicecustoms · independentpaymentinspection · independent
Why independent
  • inspection (surveyor, inspectorate, weighbridge): Grade and weight are where scrap is misdescribed; a surveyor or weighbridge has no stake in the price.
  • customs (customs): The declared weight and value at the border.
Grade scale
metal content, percent: set by the pair from its own inspection contract - Mirror publishes no scrap grade scale
Legs join on
Container (ISO 6346) and voyage · Bill of lading · Vessel IMO, port and load date
Tolerance ceiling
at most 1 band either side
Edges come from
mirror-negotiate or pair-agreed never from Mirror
Reaches
Misdeclared goods / substitution · Over-invoicing · Under-invoicing · Phantom / short shipment
Runs on
mirror-dims mirror-assay mirror-voyage mirror-customs
Cannot see
  • Grade is contested even between honest inspectors - agree the inspection contract before the table.
  • A vessel key joins only a full cargo; a part cargo joins on its own bill of lading.
  • An AIS track proves where the ship was, not what it carried.

From template to a running corridor

A countersignature, not a six-month negotiation.

The steps run in this order, and each one is code: the handshake, the shadow run, the ceremony and the ratification. Nothing in them sends a price to anyone.

The whole life of a corridor
  1. 1

    Start from the template

    The goods' template says what to band, which legs to require and which must be independent.

  2. 2

    Find a table you both hold

    Each bank signs the tables it already supports; both compute the same finest shared one, or a clean no_shared_table.

  3. 3

    Try it on your own book

    Shadow mode runs candidate tables over the bank's own legs and submits nothing: counts, and each table's blind spot.

  4. 4

    Agree the terms and hold the ceremony

    A charter, then both banks prove they loaded the same secret without sending it. A calendar hash ratchet is optional.

  5. 5

    Ratify, with a start and an end

    Quorum ratification, an effective time, and if wanted a valid_until after which the table judges nothing.

  6. 6

    Run, renew, retire

    Band and reconcile; one ratified FX basis across currencies; zoom into one shipment by consent; renew as a new version.

What a template is not

Not a price list, and not Mirror's table.

Corridor templates for goods that trade-based laundering favours: what a corridor for each must band, which legs it must require, which of them must come from a party with no stake in the price, which identifiers join its legs, and which typologies it reaches. A template carries NO price, NO band edge and NO tolerance a pair did not ratify - Mirror invents no prices. The numbers that do appear are grade hallmarks (fineness in parts per thousand), which are standards, not prices. A pair ratifies its own table against a template; kernel/mirror-library.js validateProposal checks the shape of that table and never its values.

  • mirror-negotiate Each bank probes a shared grid of candidate price points from its own book; the jointly acceptable runs become the edges. Neither bank shows the other its book, and Mirror supplies no price.
  • pair-agreed The two banks agree the table between themselves, outside the rail, and record who chose it and from what (mirror-provenance).

The goal is a table an industry body ratifies and two banks both reference. Mirror holds templates and the hashes of tables the parties ratified; it never authors the numbers in them. See the open corridor-table standard and Boundary 2 of the register.