Layer 0 Infrastructure – How LayerZero and IBC (Cosmos) Enable Cross-Chain Messaging Without Bridges

Isolation is something that a majority of early protocols assumed wouldn't be a problem due to the multi-chain nature of cryptocurrency and the fact that each digital token had a home on a specific blockchain. For example, if you hold Ethereum (ETH) then Ethereum is where it resides, or if you have a token of the Cosmos Network (ATOM) then that token will reside within the Cosmos Network as well as if you were holding a token from Solana (SOL), it will reside within Solana. The reality is that in order to transfer your assets or data between any of the major blockchain's ecosystems, you have always had to put your trust into a bridge, which is typically a centralized or semi-centralized entity that mints wrapped versions of your tokens on one blockchain while locking them up on another.

However, they only function until there's an issue, and as if correlations were to have a direct economic relationship, bridges have resulted in over $2 billion of losses due to bridge hacks since 2021 and have become one of the largest vectors of attack in the cryptocurrency ecosystem. The response from Layer 0s to the problems created by traditional bridges is a new vertical for the Layer 0s, which includes protocols such as LayerZero and Cosmos (Inter-Blockchain Communication IBC), which fundamentally shift how cross-chain communications occur by using direct cross-chain messaging and decreasing trust through bypassing the need for a wrapped token and using a honeypot of whale liquidity. The only information transferred is data.

Why Traditional Bridges Are a Structural Weakness

When it comes to bridges, the security model has always been an issue, as most bridges utilize a multisig/shared validator set to monitor state transitions on one blockchain and approve actions on another blockchain. There is an inherent risk that any asset being bridged could be compromised by a single hack due to the fact that hundreds of applications rely on the same handful of validators. The focus of vulnerability in the Wormhole hack, Ronin bridge hack and Nomad drain was the validator or contracts layer for a bridge disregarding the underlying blockchains. The blockchains were more than capable of supporting the transactions and processes occuring. The failure was in how the middleman performed.

For this reason, the crypto industry has transitioned away from asset-wrapping bridges and towards using messaging protocols for interoperability of multiple blockchains. A message protocol will facilitate direct communication between smart contracts located on multiple blockchains by allowing both parties to cross-validate transactions, issue and receive instructions, and to settle it directly rather than locking up tokens and minting them as a representation of the original. An analogy to this would be to compare sending a fax that requires the recipient to take action to sending and receiving products between two locations. The original product never actually leaves the location you sent it from.

LayerZero: The Omnichain Messaging Protocol

LayerZero approaches cross-chain communication in a very different way. LayerZero functions as a message protocol rather than a bridge that stores or moves assets. It allows arbitrary data, like price feeds, execution instructions, governance votes, and token balances, to be sent straight from smart contracts on one blockchain to those on another. Since its inception, the protocol has enabled more than $50 billion in transfer volume, supports more than 120 chains, and routes about 1.5 million cross-chain messages monthly. Under a three-year lockup, Andreessen Horowitz purchased $55 million worth of ZRO tokens in April 2025, indicating a strong institutional commitment to the omnichain theory.

LayerZero has established Ultra Light Nodes (ULNs) as endpoints across every blockchain that it supports. When a cross-chain message is initiated, the ULN on the source chain creates a message packet.

An oracle and a relayer are used as independent parties to provide confirmation for the message packet: oracles provide the block header data, while relayers provide evidence that the transaction took place. After both of these independent entities have confirmed that the packet is correct, the ULN on the destination chain accepts and processes the message. As a result of this architecture, no validator sets have been compromised.

LayerZero does not provide liquidity pools, mint wrapped tokens, or hold onto funds in any way. Thus, there is no "honeypot" problem associated with bridges, and all information passes through validated channels.

Cosmos IBC: The Trust-Minimized Standard

The ultimate goal of IBC's evolution is the inter-chain communication of blockchains without needing any intermediary cross-chain bridges to take you where you want to go; it is in itself a way to access multiple different but interconnected blockchain networks. This open source protocol was created within the Cosmos ecosystem, and uses "light clients" as a means of transit and authentication between two blockchains during the transit of data. Currently, more than 115 separate independent blockchains use this protocol, allowing for approximately $3 billion of transactions each month. Since the protocol's introduction in 2021, it has never been compromised.

The security model of IBC is quite simple to understand. Each blockchain that is linked to another blockchain creates a light client of the other in lieu of relying on third parties like validators or oracle nodes for verification/validation of their respective state of consensus. The overall security for the IBC connection between the two independent blockchains is also directly proportional to the overall security of the two connected independent blockchains. If you trust the consensus of the other independent blockchain, then the communication between these two independent blockchains will also be trusted. Relayers (programs operated off-chain) are responsible for relaying state updates between the two independent blockchains and while relayers maintain all off-chain state updates, they are prevented from tampering with or altering the communication relayed between two independent blockchains because of the use of light clients by both parties to independently verify all claims in the consensus of both independent blockchains.

As of March 2025, the IBC v2 protocol has now connected non-Cosmos-native chains with Ethereum (EVM) chains by allowing for a secure, low-cost way to connect them using the ZK verification method. This is another major advance in the evolution of IBC.

LayerZero vs. IBC: Different Designs, Same Mission

Although different in terms of compromise made, both approaches aim to solve the same problem. LayerZero is inherently chain agnostic due to their modular security paradigm allowing for each application to define its own verification standard for each messaging channel. Therefore, LayerZero can be used on EVM chains, Solana, Sui, Aptos, and other chains. However, the application developers are responsible for securing their own configurations, even though the flexibility of LayerZero is impressive.

Because IBC's light client model has more stringent trust assumptions, arguably IBC's model is more elegant by requiring only the chains themselves be used as external verification entities, which has resulted in the protocol passing over 115 chains without any vulnerabilities.

In reality, it is more likely that both LayerZero and IBC will be used as opposed to one competing against the other. The advantage of LayerZero is its ability to provide fast cross-chain communication with the flexibility of having customizable levels of trust. The advantage of IBC is that it facilitates communication with minimal levels of trust on ecosystems that accept light client verification, and will eventually be available on both Ethereum and Solana.

Ultimately, the decision cryptocurrency developers are going to make in developing cross-chain applications will come down to which chains they want to target and the amount of security they wish to modify.

What This Means for the Multi-Chain Future

The change from bridges to native messaging systems requires a complete redesign of the way information and value move through the crypto ecosystem. This is more than just improving technology; it's a way to redesign the entire blockchain protocol. By using LayerZero's Omnichain Fungible Token (OFT), projects can create one canonical token supply that can easily transfer between different blockchains without requiring a 'wrapped' token. With IBC's Interchain Accounts (IAs) standard, users will be able to hold accounts on distant blockchains while still being able to stay on their original blockchain. This is a huge change, as these protocols represent the infrastructure layer that allows for the end user to not see the multi-chain experience, which is a necessary condition of future growth of cryptocurrency beyond the existing number of users.