# Registry

#### Mint DID

The format for a DID name requires a length between 5 and 54 characters, and only allows the use of lowercase letters a-z and digits 0-9.

```solidity
function mint(address to, uint256 expiredTimestamp, string memory did, bytes memory evidence, string calldata avatar) public;
```

* to: DID address
* expiredTimestamp: the expired time of the evidence
* did: DID name
* evidence: the signature signed by HashKey DID
* avatar: the url of avatar

#### Add authorization address

Authorize a DID to an address so that the address can view your DID information or log in to other systems on your behalf.

```solidity
function addAuth(uint256 tokenId, address addr) public;
```

* tokenId: DID token id
* addr: authorization address

#### Remove authorization address

Remove the address that you had previously authorized.

```solidity
function removeAuth(uint256 tokenId, address addr) public;
```

* tokenId: DID token id
* addr: authorization address


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