Credential

Set Transferable

Credential could be transferable or non-transferable. The function can reverse it. Can only be invoked by issuer or HashKey DID.

function reverseTransferable() public onlyControllers;

Set Supply

The supply of a credential can be fixed. Can only be invoked by issuer or HashKey DID.

function setSupply(uint256 tokenId, uint256 supply) public onlyControllers;

• tokenId: DID token id

• supply: max supply

Get URI

Retrieve the tokenURI (i.e., the link to the metadata) associated with a given tokenId.

function uri(uint256 tokenId) public view override returns (string memory);

• tokenId: DID token id

Issue DeedGrain

An institution can obtain evidence signed by a HashKey DID and use that evidence to issue DeedGrain.

function issueDG (string memory _name, string memory _symbol, string memory _baseUri, bytes memory _evidence, bool _transferable) public;

• _name: credential name

• _symbol: credential symbol

• _baseUri: credential baseUri

• _evidence: signature signed by HashKey DID

• _transferable: whether DeedGrain is transferable