​
Calls

​
notePreimage

Register a preimage on-chain. If the preimage was previously requested, no fees or deposits are taken for providing the preimage. Otherwise, a deposit is taken proportional to the size of the preimage. Namespace 
api.tx.preimage.notePreimage
Type 
function notePreimage(
  bytes: Bytes
)

​
requestPreimage

Request a preimage be uploaded to the chain without paying any fees or deposits. If the preimage requests has already been provided on-chain, we unreserve any deposit a user may have paid, and take the control of the preimage out of their hands. Namespace 
api.tx.preimage.requestPreimage
Type 
function requestPreimage(
  hash: H256
)

​
unnotePreimage

Clear an unrequested preimage from the runtime storage. Namespace 
api.tx.preimage.unnotePreimage
Type 
function unnotePreimage(
  hash: H256
)

​
unrequestPreimage

Clear a previously made request for a preimage. IMPORTANT: This must not be called onhashmore times thanrequest_preimage. Namespace 
api.tx.preimage.unrequestPreimage
Type 
function unrequestPreimage(
  hash: H256
)

​
Storage

​
preimageFor

The preimages stored by this pallet. Namespace 
api.query.preimage.preimageFor
Type 
function preimageFor(
  H256
): Option<Bytes>

​
statusFor

The request status of a given hash. Namespace 
api.query.preimage.statusFor
Type 
function statusFor(
  H256
): Option<PalletPreimageRequestStatus>

​
Events

​
Cleared

A preimage has ben cleared. Namespace 
api.events.preimage.Cleared
Type 
type Cleared = {
  hash: H256
}

​
Noted

A preimage has been noted. Namespace 
api.events.preimage.Noted
Type 
type Noted = {
  hash: H256
}

​
Requested

A preimage has been requested. Namespace 
api.events.preimage.Requested
Type 
type Requested = {
  hash: H256
}

​
Errors

​
AlreadyNoted

Preimage has already been noted on-chain. Namespace 
api.errors.preimage.AlreadyNoted

​
NotAuthorized

The user is not authorized to perform this action. Namespace 
api.errors.preimage.NotAuthorized

​
NotNoted

The preimage cannot be removed since it has not yet been noted. Namespace 
api.errors.preimage.NotNoted

​
NotRequested

The preimage request cannot be removed since no outstanding requests exist. Namespace 
api.errors.preimage.NotRequested

​
Requested

A preimage may not be removed when there are outstanding requests. Namespace 
api.errors.preimage.Requested

​
TooLarge

Preimage is too large to store on-chain. Namespace 
api.errors.preimage.TooLarge
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