> For the complete documentation index, see [llms.txt](https://docs.iotex.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.iotex.io/depin/iotex-depin-modules/w3bstream/build-with-w3bstream/get-started/w3bstream-tasks.md).

# W3bstream Tasks

{% hint style="info" %}
This documentation is currently being updated. Please check back later for the latest version.
{% endhint %}

```go
type Task struct {
	// This is the task unique identifier, represented as a Hash
	ID             common.Hash `json:"id"`
	// This is the sequence number for the task to ensure ordering and prevent replay
	Nonce          uint64      `json:"nonce"`
	// This is the DePIN Project ID, represented as a big integer
	ProjectID      *big.Int    `json:"projectID"`
	// This represent a specific version for the project file in case it's been updated
	ProjectVersion string      `json:"projectVersion,omitempty"`
	// This is the public key of the device (or "client") that authorized the task
	DevicePubKey   []byte      `json:"devicePublicKey"`
	// This is the raw data payload containing the message(s) to be processed
	Payload        []byte      `json:"payload"`
	// This is the cryptographic signature of the task
	Signature      []byte      `json:"signature,omitempty"`
	// This is the hash of the payload data
	PayloadHash    common.Hash `json:"payloadHash,omitempty"`
	// This is the hash of the task structure itself
	TaskHash       common.Hash `json:"taskHash,omitempty"`
	// This points to the previous task in the sequence, forming a chain
	PrevTask       *Task       `json:"previousTask,omitempty"`
}
```

<https://github.com/iotexproject/w3bstream/blob/283aae188f03f9dfd0ef40027fd9ab837e41a9c9/task/task.go#L14>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.iotex.io/depin/iotex-depin-modules/w3bstream/build-with-w3bstream/get-started/w3bstream-tasks.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.