# GYD 跨链桥接

主要的 GYD 合约部署在以太坊上，GYD 的铸造和赎回操作也在以太坊上进行。通过跨链桥接，GYD 可在 L2 上使用。有限数量的 GYD 可以通过特殊的 AMO 池直接在 L2 上获取，这些池子在 L2 上持有有限数量的储备资产。

跨链合约以可升级的方式部署，这允许未来通过治理更换跨链服务提供者。

### Arbitrum <a href="#arbitrum" id="arbitrum"></a>

目前，Ethereum 和 Arbitrum 之间的 GYD 跨链桥使用 Chainlink CCIP。该桥接通过标准的锁定-铸造机制工作，并通过 CCIP 消息传递与 Arbitrum 进行通信。

| Contract        | Chain    | Purpose                                               | Address                                                                                                               |
| --------------- | -------- | ----------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------- |
| GydL1CCIPEscrow | Ethereum | Entry point for bridging. Holds GYD bridged to L2     | [0xa1886c8d748DeB3774225593a70c79454B1DA8a6](https://etherscan.io/address/0xa1886c8d748DeB3774225593a70c79454B1DA8a6) |
| L2Gyd           | Arbitrum | GYD Token contract on L2. L2 entry point for bridging | [0xCA5d8F8a8d49439357d3CF46Ca2e720702F132b8](https://arbiscan.io/address/0xCA5d8F8a8d49439357d3CF46Ca2e720702F132b8)  |
| CCIP Router     | Ethereum | Used in the background for communication              | [0x80226fc0Ee2b096224EeAc085Bb9a8cba1146f7D](https://etherscan.io/address/0x80226fc0Ee2b096224EeAc085Bb9a8cba1146f7D) |
| CCIP Router     | Arbitrum | Likewise                                              | [0x141fa059441E0ca23ce184B6A78bafD2A517DdE8](https://arbiscan.io/address/0x141fa059441E0ca23ce184B6A78bafD2A517DdE8)  |

### Polygon zkEVM <a href="#polygon-zkevm" id="polygon-zkevm"></a>

Ethereum 和 Polygon zkEVM 之间的 GYD 跨链目前使用的是 Polygon zkEVM 官方桥跨链。

| Contract             | Chain    | Purpose                                               | Address                                                                                                                        |
| -------------------- | -------- | ----------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------ |
| GydL1Escrow          | Ethereum | Entry point for bridging. Holds GYD bridged to L2     | [0xF3387a880998C9B9169bc9973E8826Fc9035c171](https://etherscan.io/address/0xf3387a880998c9b9169bc9973e8826fc9035c171)          |
| L2Gyd                | zkEVM    | GYD Token contract on L2. L2 entry point for bridging | [0xCA5d8F8a8d49439357d3CF46Ca2e720702F132b8](https://zkevm.polygonscan.com/token/0xca5d8f8a8d49439357d3cf46ca2e720702f132b8)   |
| PolygonZkEVMBridgeV2 | Ethereum | Used in the background for communication              | [0x2a3DD3EB832aF982ec71669E178424b10Dca2EDe](https://etherscan.io/address/0x2a3DD3EB832aF982ec71669E178424b10Dca2EDe)          |
| PolygonZkEVMBridgeV2 | zkEVM    | Likewise                                              | [0x2a3DD3EB832aF982ec71669E178424b10Dca2EDe](https://zkevm.polygonscan.com/address/0x2a3DD3EB832aF982ec71669E178424b10Dca2EDe) |


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