assetIdis encoded in a compressed form called the Minting Blob which is required in order to withdraw on-chain. The
assetIddefinition is specified here. Notice that the Minting Blob is not stored on-chain and should be received out of band.
assetId(for instance, minting a large amount of ETH), off-chain minting can only create a mintable
assetIdif it respects the following conditions:
assetIdmust be 1
StarkKey, a mintable
assetIdand an amount.
withdrawAndMintand provide the
mintingBlobfor the asset contract to create the token.