> For the complete documentation index, see [llms.txt](https://tizimoney.gitbook.io/tizi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tizimoney.gitbook.io/tizi/users-guide/manager.md).

# Roles

In the smart contracts, four roles are established for access control: **Admin**, **Manager**, **Attester**, and **Strategy Manager**. The appointment and revocation of all other roles are handled by the System Admin.

**Manager**: The Manager is responsible for managing and investing the project's USDC. In terms of fund management, the Manager ensures sufficient funds for normal operations by retaining a portion of the project's funds and periodically withdrawing USDC stored in strategies back to the project. The Manager handles operations such as transferring USDC across chains, depositing and withdrawing funds in yield-farming strategies, executing harvests, and adjusting liquidity between strategies and chains. All operations performed by the Manager in the contracts are subject to strict rules and limitations. USDC can only circulate between internal project contracts and cannot be traded with individuals.

**Admin**: The System Admin is responsible for the appointment and revocation of other management roles, adjusting all important contract parameters, and sending messages across different chains. The System Admin is the most critical role and holds authority over all non-fund-related operations. The sole System Admin privilege has been assigned to a multi-signature wallet.

**Attester**: The attester is solely used to sign messages during the message transmission process to provide an additional verification safeguard in case the LayerZero infrastructure is compromised, and does not hold any other authority. This role can be granted and revoked by Admin only.

**Strategy Manager**: The Strategy Manager is responsible for operations related to self-built strategies.