LayerZero

Holograph is an omnichain tokenization protocol that enables asset issuers to mint natively composable omnichain tokens. It has been used to mint millions of on-chain assets, making it one of the most widely used protocols for cross-chain asset production and distribution. Holograph works by burning tokens on the source chain, sending a message via a messaging protocol to the destination chain, and then reminting the same number of tokens to the same contract address. This process unifies liquidity, eliminates slippage, and preserves fungibility across blockchains. The protocol facilitates the use of a single, unique contract address on all EVM blockchains, allowing for all subsequent contracts to be derived from them. This approach ensures that contract addresses remain the same no matter where they are deployed, supporting all existing and future EVM chains. Holograph provides a complete solution for asset issuers with a customizable infrastructure for omnichannel token creation.

Bringing interoperability and scalability with cutting-edge zero-knowledge proof systems. zkBridge uses zkSNARKs to enable a prover to efficiently convince the receiver chain that a certain state transition happened on the sender chain. zkBridge consists of a block header relay network and an updater contract. The block header relay network retrieves the block headers from the sender chain, generates proofs of the validity of the block headers, and sends the headers along with the proofs to the updater contract (set up on the receiver chain). The updater contract maintains a light-client state. It automatically adds block headers of the sender chain once the associated proofs are verified, and updates the current main chain of the sender chain. Polyhedra Network implements infrastructures for interoperability across heterogeneous systems which guarantee strong security without extra trust assumptions.