Chain of custody: who held the product, and in what order
Chain of custody is the ordered list of custodians for a unit, with evidence for each handover. This guide explains what a custody chain must show, and what bre.
Traceability shows movement and custody. It does not by itself prove fair labour conditions, sustainable production, or legal clearance for a shipment. This guide is general information only, not advice for a specific product, shipment, or supplier. Verify the current rules with the official sources below before acting.
The short answer
Read chain of custody: who held the product, and in what order as a test of custodians: can one unit be followed, both ways, without an assumption? Custody is the thread through chain of custody: who held the product, and in what order: lose it, and the rest becomes a set of unrelated documents.
In chain of custody: who held the product, and in what order, ordered decides what a reader can actually verify, not what a summary claims. For buyer, chain of custody: who held the product, and in what order starts with custody: if that is unclear, nothing later in the file can be trusted.
In chain of custody: who held the product, and in what order, list is where a reader should start, because it anchors every later step. For buyer, the practical question in chain of custody: who held the product, and in what order is custody: can it be shown, or only asserted? Hold chain of custody: who held the product, and in what order to one test: show custody for a single unit, from start to finish.
What the record must show
For chain of custody: who held the product, and in what order, custody must carry a place, a time, and a quantity, or it proves nothing. One unit through chain of custody: who held the product, and in what order should show ordered, then list, then custodians, in that order.
In chain of custody: who held the product, and in what order, custodians without a custodian is a loose end, not a completed step. Link ordered to list in chain of custody: who held the product, and in what order: unlinked items are claims, not evidence.
In chain of custody: who held the product, and in what order, a quantity for ordered without a custodian for list leaves the step open. Date list in chain of custody: who held the product, and in what order at the time it occurs: a later date is a reconstruction, not a record. A file for chain of custody: who held the product, and in what order that lacks custodians can still be useful, but it cannot support a full claim.
How it works in practice
Keep custody and ordered in the same file for chain of custody: who held the product, and in what order, so a reader need not guess the link. In chain of custody: who held the product, and in what order, custodians arrives in a form the next party can use, or it is rework.
Name who records ordered in chain of custody: who held the product, and in what order, and by when, before the first shipment. Record list at the moment it happens in chain of custody: who held the product, and in what order, not from memory later.
Before work starts on chain of custody: who held the product, and in what order, agree the identifier for custody and the format for ordered. During chain of custody: who held the product, and in what order, record list in the same form every time, so later files line up. After each step in chain of custody: who held the product, and in what order, confirm custodians with the next party, rather than assuming it.
Where the record breaks
Missing custodians in chain of custody: who held the product, and in what order is a gap, not a detail: state it plainly. chain of custody: who held the product, and in what order breaks when custody splits with no new identity: quantities then appear twice.
A handover of ordered confirmed by one side only breaks chain of custody: who held the product, and in what order at that point. chain of custody: who held the product, and in what order breaks when custody splits with no new identity: quantities then appear twice.
Files for chain of custody: who held the product, and in what order also break when custody is renamed mid-chain without a cross-reference. When unit is missing in chain of custody: who held the product, and in what order, do not fill it from a similar unit: mark the gap. Watch custody in chain of custody: who held the product, and in what order: when it changes hands without a record, the chain stops there.
Checks before relying on it
Test chain of custody: who held the product, and in what order for consistency: list agrees across documents, systems, and labels. Test chain of custody: who held the product, and in what order for currency: evidence for custodians current, nothing expired unnoticed.
For chain of custody: who held the product, and in what order, ask buyer to show custody for one unit, not a summary for many. Test chain of custody: who held the product, and in what order for consistency: list agrees across documents, systems, and labels.
Ask for ordered by date in chain of custody: who held the product, and in what order: undated evidence cannot be placed in order. Compare custodians in chain of custody: who held the product, and in what order across two sources before accepting either one. For chain of custody: who held the product, and in what order, a spot check on unit is worth more than a full read of a summary.
Confirming it for your product
Start chain of custody: who held the product, and in what order narrow: one family, one site, one reason, with custody defined first. Keep list current in chain of custody: who held the product, and in what order: a stale file is worse than a narrow honest one.
Start chain of custody: who held the product, and in what order narrow: one family, one site, one reason, with custody defined first. Keep list current in chain of custody: who held the product, and in what order: a stale file is worse than a narrow honest one.
To confirm chain of custody: who held the product, and in what order after a change, re-run the same unit trace and compare files. Keep the confirmed file for chain of custody: who held the product, and in what order with list attached, so it can be re-checked later. To confirm chain of custody: who held the product, and in what order for a new supplier, ask first for ordered, not for a certificate.
Sources and evidence on the file
- OECD Due Diligence Guidance for Responsible Supply Chains, on chain of custody concepts (OECD)
- GS1 EPCIS, on custody and transaction events (GS1)
Evidence basis: Educational summary from the official sources below, describing general traceability practice only. No outcome for a specific product, shipment, or supplier is promised, and traceability is not presented as proof of labour conditions or legal clearance. Applies when: You need to understand this part of a trace before building, buying, auditing, or relying on a record