# GP 8: Extend pool limits for KYC'd users {% hint style="success" %} Proposal was confirmed and executed: \ {% endhint %} ## Objective Allow KYC'd users to deposit additional funds into zkBOB. An additional tier is added to increase limits to 20,000 BOB per day for users who hold a BAB NFT on Binance Chain. ### BAB NFTs In 2022, Binance introduced soulbound tokens known as [Binance Account Bound (BAB) tokens](https://www.binance.com/en/support/faq/frequently-asked-questions-on-binance-account-bound-bab-token-adbd05fe149344d59a348f82d5bf359d). These tokens serve as identity credentials for Binance users who have completed KYC verification. These credentials can be extended to other chains using the [KnowYourCat](https://docs.knowyourcat.id/) protocol. ### KnowYourCat Protocol Information about BAB token ownership can be transferred from BNB Smart Chain to additional chains using the [KnowYourCat](https://docs.knowyourcat.id/) protocol. This protocol creates a cryptographic proof that a user possesses the token on BSC and lets users provide this proof to other supported chains. A user's BAB token status can be obtained from an NFT-compatible contract. The official KnowYourCat contract on Polygon is at [0xE3c6Fd631043A0a1927c4681C736b778aA8F8feF](https://polygonscan.com/address/0xE3c6Fd631043A0a1927c4681C736b778aA8F8feF), as referenced in the [KnowYourCat documentation](https://docs.knowyourcat.id/for-developers/knowyourcat-protocol/contract-addresses). ## Mechanism To extend limits for BAB token holders, this proposal creates a new tier limit in the zkBob pool and configures a KYC Provider Manager which checks the status of BAB token ownership on the KnowYourCat NFT contract. The KYC Provider Manager manager is deployed at [0xb8580ea6312dd2311d72bc932b0354a07d974138](https://polygonscan.com/address/0xb8580ea6312dd2311d72bc932b0354a07d974138). This manager contract introduces the method `getIfKYCpassedAndTier` to access the limit tier for a user owning a BAB token. The manager provides `254` as the tier id for users who hold a BAB NFT. The manager is configured so that each time a user requests a deposit, the account is checked to see if it has its own tier limit. If it does not, the manager is asked to return the tier and default limits apply. ## Proposal breakdown The corresponding transaction in the governance safe is[ transaction #28](https://app.safe.global/matic:0xd4a3D9Ca00fa1fD8833D560F9217458E61c446d8/transactions/tx?id=multisig_0xd4a3D9Ca00fa1fD8833D560F9217458E61c446d8_0x313f81393765ffe7f9353306248891380ad4c14f95a270ef05dbbe520c48acab). The transaction contains 2 actions: ### Action 1 `setLimits` (the selector is `0xe8fd02e4`) is called from the zkBobPool contract ([0x72e6B59D4a90ab232e55D4BB7ed2dD17494D62fB](https://polygonscan.com/address/0x72e6B59D4a90ab232e55D4BB7ed2dD17494D62fB)). The method is called to configure limits for tier `254` which is associated with BAB token owners. The limits for this tier differ from tier `0` where `dailyUserDepositCap` and `depositCap` are both 10,000 BOB. ``` tvlCap: 1'000'000 BOB dailyDepositCap: 300'000 BOB dailyWithdrawalCap: 100'000 BOB dailyUserDepositCap: 20'000 BOB depositCap: 20'000 BOB dailyUserDirectDepositCap: 10'000 BOB directDepositCap: 1'000 BOB ``` The `zkBobPool` contract is upgraded to reflect these changes. ([0x72e6B59D4a90ab232e55D4BB7ed2dD17494D62fB](https://polygonscan.com/address/0x72e6B59D4a90ab232e55D4BB7ed2dD17494D62fB)). The new implementation [0x0eDcE5CAf830c6b845503001D8378b0d4F3b89bB](https://polygonscan.com/address/0x0eDcE5CAf830c6b845503001D8378b0d4F3b89bB) is applied through the `upgradeTo` call (the selector is `0x3659cfe6`). ### Action 2 `setKycProvidersManager` (the selector 790c3a33) is called from the zkBobPool contract ([0x72e6B59D4a90ab232e55D4BB7ed2dD17494D62fB](https://polygonscan.com/address/0x72e6B59D4a90ab232e55D4BB7ed2dD17494D62fB)). This method configures the contract [0xb8580ea6312dd2311d72bc932b0354a07d974138](https://polygonscan.com/address/0xb8580ea6312dd2311d72bc932b0354a07d974138) as the KYC Provider Manager. ## Verification Proposal execution can be verified in the [zkBobPool contract](https://polygonscan.com/address/0x72e6B59D4a90ab232e55D4BB7ed2dD17494D62fB#readProxyContract): 1. The method `kycProvidersManager` must return `0xb8580ea6312dd2311d72bc932b0354a07d974138` 2. The method `getLimitsFor` for an account synchronised with BAB token ownership information through [the KnowYourCat protocol](https://knowyourcat.id/) should display new limits. For example, one could use the account `0x813399e5b08Bb50b038AA7dF6347b6AF2D161828`. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://bob-docs.zkbob.com/bob-dao/governance/protocol-governance/gp-8-extend-pool-limits-for-kycd-users.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. 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