W3bstream Tasks

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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