ConsumeAssetTx is used to consume an asset. This can be used if the asset needs to be marked as a state where no further change should happen.

After ConsumeAssetTx is executed, asset readonly would be set to True, transferrable would be set to False, which means this asset can no longer be updated or transferred to other people.

Sample Code

message ConsumeAssetTx {
  string issuer = 1;
  string address = 2;

  google.protobuf.Any data = 15;
NameData TypeDescriptionRequired
issuerstringCould be the same as from, or different, depending on use case. when this tx is being mutisigned by the asset holder.Yes
addressstringAddress of the parent asset. If this is provided, besides issuer we will verify if the parent address of the asset equals to this address.
data (optional)Google.Protobuf.AnyCustom user data

Sample Usage

A museum issued a ticket and Alice bought it. At the door of the meseum, Alice need to consume the asset, which she scan a QR code with a pre-populated ConsumeAssetTx. Most of the time, this pre-populated tx shall be signed by the account of the door so that one can trace where and how Alice consumed this asset, however we don't want anyone to be able to create this tx to allure Alice to consume the asset, thus the door shall be an account that issued by the museum. The chain will make sure only accounts that has this issuer would be able to successfully sign this tx.

# say we have two wallets: cinema and alice, alice has an asset ticket
itx = cinema.address)
tx = ForgeSdk.prepare_consume_asset(itx, wallet: cinema)
# then alice attach her signature to this tx
tx = ForgeSdk.finalize_consume_asset(tx, ticket.address, wallet)

Who can prepare a ConsumeAssetTx

Thus to consume an asset, the initiator must be the wallets belong to the issuer of the asset, e.g. a cinema. The consume transaction is pre-signed at the check point (e.g. the door of the cinema), and the user could then multi-sign the transaction with the asset address included in the data field of the multisig message. See below explanation.