---
title: "Chain"
description: "the parties around a sale, each handing demand to the next; its stocks with a side and a reader, its handovers counted as facts, its leaks"
section: concepts
address: /concepts/chain
contract: 0476e35e6e275db5
---

# Chain

the parties around a sale, each handing demand to the next; its stocks with a side and a reader, its handovers counted as facts, its leaks

[figure: Chain is a definition at platform scope. The drawing shows its fields and the objects that they point at.]

| property | value |
|---|---|
| kind | definition |
| scope | platform |
| key | the vertical |
| store | postgres |
| family | market |



## Fields


| field | type | required | note |
|---|---|---|---|
| `vertical` | `id` | yes |  |
| `stocks` | [ChainStock](/concepts/chainstock) | yes |  |
| `handovers` | [ChainHandover](/concepts/chainhandover) | yes |  |
| `leaks` | [Leak](/concepts/leak) | yes |  |
| `loop` | `text` | yes |  |



## Routes that use it
- [`/v1/read/chain`](/reference/read/chain) returns it