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LayerZero

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LayerZero Overview

What is LayerZero?: LayerZero is an interoperability protocol that enables communication and messaging across different blockchain networks, allowing for the easy transfer of assets and data. It provides the foundation for building decentralized applications (dApps) that can operate across multiple chains without compromising security or efficiency. An example is a cross-chain DEX that can facilitate a swap of tokens built on different blockchains. This technology aims to fix the issue of fragmentation in the ecosystem by offering a solution for true omnichain interoperability, enhancing the connectivity and utility of dApps.
Blockchains: Polygon, Ethereum, Optimism, Arbitrum, ZkSync Era, Base, Blast, Linea, Scroll

Find More on LayerZero's Website

Frequently asked questions

What is LayerZero?

LayerZero is an omnichain interoperability protocol that enables the realization of cross-chain applications with a low-level communication primitive. It is a User Application (UA) configurable on-chain endpoint that runs a ULN. LayerZero relies on two parties, the Oracle and the Relayer, to transfer messages between on-chain endpoints. When a UA sends a message from one chain to another, the message is routed through the endpoint on the source chain. The endpoint then notifies the specified Oracle and Relayer of the message and its destination chain. The Oracle forwards the block header to the endpoint on the destination chain, and the Relayer submits the transaction proof. The proof is validated on the destination chain, and the message is forwarded to the destination address.

How does LayerZero facilitate cross-chain communication?

LayerZero facilitates cross-chain communication by using a User Application (UA) configurable on-chain endpoint that runs a ULN. When a UA sends a message from one chain (chain A) to another chain (chain B), the message is routed through the endpoint on chain A. The endpoint then notifies the specified Oracle and Relayer of the message and its destination chain. The Oracle forwards the block header to the endpoint on chain B, and the Relayer submits the transaction proof. The proof is validated on the destination chain, and the message is forwarded to the destination address.

What is a User Application (UA)?

A User Application (UA) is a configurable on-chain endpoint that runs a ULN (User Layer Network). In the context of LayerZero, a UA is used to transfer messages between on-chain endpoints on different chains. When a UA sends a message from one chain to another, the message is routed through the endpoint on the sending chain. The endpoint then notifies the specified Oracle and Relayer of the message and its destination chain. The Oracle forwards the block header to the endpoint on the receiving chain, and the Relayer submits the transaction proof. The proof is validated on the receiving chain, and the message is forwarded to the destination address.

What is ULN?

ULN stands for User Application (UA) configurable on-chain endpoint that runs on LayerZero. It is a component of LayerZero, which is a trustless, omnichain interoperability protocol. ULN relies on two parties, the Oracle and the Relayer, to transfer messages between on-chain endpoints. When a user application sends a message from one chain to another, the message is routed through the ULN endpoint on the source chain. The endpoint then notifies the specified Oracle and Relayer about the message and its destination chain. The Oracle forwards the block header to the endpoint on the destination chain, and the Relayer submits the transaction proof. The proof is validated on the destination chain, and the message is forwarded to the destination address.

How does LayerZero rely on the Oracle and Relayer?

LayerZero relies on the Oracle and Relayer to transfer messages between on-chain endpoints. When a User Application (UA) sends a message from one chain to another, the message is routed through the endpoint on the sending chain. The endpoint then notifies the specified Oracle and Relayer of the message and its destination chain.

The Oracle forwards the block header to the endpoint on the receiving chain, and the Relayer submits the transaction proof. The proof is validated on the receiving chain, and the message is then forwarded to the destination address.

In summary, the Oracle and Relayer play crucial roles in facilitating the transfer of messages between on-chain endpoints in LayerZero.

What are the parameters of the endpoint.send() function in LayerZero?

The endpoint.send() function in LayerZero has six parameters. They are:

uint16 _chainId: The destination chainId.
bytes calldata _destination: The destination contract address.
bytes calldata _payload: The raw bytes of your payload.
address payable _refundAddress: The address where additional gas is refunded.
address paymentAddr: An optional parameter.
bytes calldata txParameters: Airdrop native gas.

Here is an example usage of the endpoint.send() function:

endpoint.send{value:msg.value}(10001, destUaAddr, bytes("hello"), msg.sender, address(this), bytes(""));

Where can I find more information about LayerZero?

To find more information about LayerZero, you can visit their official website at https://layerzero.network/. The website provides details about LayerZero's omnichain interoperability protocol and its core concepts. Additionally, you can access their whitepaper for more in-depth information.