> For the complete documentation index, see [llms.txt](https://docs.hashkey.id/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hashkey.id/protocol/contract-api-reference/layerzero.md).

# LayerZero

#### Sync

Synchronize DID information to the destination chain through LayerZero protocol, including DID, avatar, and KYC information.

```
struct Payload {
    uint256 tokenId;        // did tokenid
    address user;           // did owner
    string did;             // did name
    string avatar;          // avatar url
    address[] KYCProvider;  // kyc provider address
    uint256[] KYCId;        // kyc id (kyc level)
    IDid.KYCInfo[] KYCInfo; // kyc info
    bytes[] evidence;       // kyc evidence signed by provider
    bytes evidenceLZ;       // evidence signed by HashKey DID
}
function sync(Payload memory _payload, uint16 _dstChainId) public;
```

* \_payload: DID infomation
* \_dstChainId: destination chain id defined by [LayerZero](https://layerzero.gitbook.io/docs/technical-reference/mainnet/supported-chain-ids)

#### Mint DID LayerZero

Minting a DID using information obtained from a sync event can only be invoked by the LayerZero endpoint or the HashKey DID endpoint (when the chain is not yet supported by LayerZero).

```
function mintDidLZ(uint256 tokenId, address user, string memory did, string memory avatar, address[] memory KYCProvider, uint256[] memory KYCId, KYCInfo[] memory kycInfo, bytes[] memory evidence)
```

* did infos args: Refer to the annotations of type `Payload` below.