# Optimistic Finality

## Protocol Optimization 

**SYNO V1 Structure**: 

* Protocol exclusively uses the Wormhole Token Bridge to send messages and values from and to the Hub (Arbitrum). 
* Due to a lack of configurability of the Token Bridge finality assumptions, transactions can only be settled with full-finality substantially crippling UX.  
* The current codebase is limited by the Arbitrum contract size limits and requires a change in favor of a modular structure to allow for a scalable design.

**SYNO V2 Structure:**

* After a thorough audit, deploy changes to the core contract logic to allow for Spoke asset-custody and use of instant finality messages avoiding the requirement of always using the Wormhole token bridge. This change gives users the option to have sub 1-minute transaction finality for any action on any chain. Optimistic Finality is expected to be a large revenue driver, with a proposed 0.40% fee on the notional asset value. 
* After the thorough audit, deploy changes the core contracts to a scalable and modular design that allows for faster feature upgrades and long term scalability. 

With careful research on block re-org risk alongside our partners at [Gauntlet](https://www.gauntlet.xyz/) we have concluded the long term safety and sustainability of utilizing instant finality for message transfer within Syno at a fee of at least 0.4%. 

**Optimistic Finality Deposits & Withdraws Flow**

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