Risks and Nuances

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Risks and Nuances
For any questions about these issues, our team is always happy to help.
Smart Contract Risk
When interacting with any smart-contract protocol, there is always some degree of risk that an edge case or code vulnerability can result in funds being lost. We take security very seriously and have extensively engaged multiple auditors across every release of new code, and maintain a comprehensive unit and integration testing suite. 
It’s important to note that despite these precautions, there is still a risk that some edge case or bug exists which could result in user funds being lost. You can review the latest audit report here.
Oracle Risk
Enzyme relies on oracles to calculate the GAVs of any investment product. If these oracles are compromised in any way, they can provide attack vectors to users which could lead to a loss of funds.
Untracked Assets
If assets appear in a Vault which were not acquired through trading, they will be untracked by the Vault and therefore not reflected in the pricing (GAV, NAV) of the Vault. Examples of when this could happen include airdrops or when a Vault Manager claims assets owed from yield farming. In order to make these assets "trackable" by the Vault, you should add them assets to Tracked Assets from your settings page. Note that as long as these assets are not claimed, the Vault may be arbitraged. It is therefore advisable that you either leverage the suite of policies available (eg. the Buy Shares Caller Whitelist or a whitelist) to mitigate these risks.
Asset Risk
It is the Portfolio Manager's responsibility to stay on top of any nuances surrounding tokens. The available asset universe is not intended to be any list of endorsement. Things to look out for could include the risk of token migrations, deviations from the ERC-20 standard, the degree of centralised custodial risk (eg. USDT) and how prices are derived (for example, we use the BTC/ETH rate for WBTC). 
Number of Positions
You can hold up to 20 positions in any Enzyme product. Note that gas costs required to operate (eg. investments, trades, etc) increase as the number of assets you hold increases.
Farming Rewards
A few things to note if farming is part of your Vault strategy.
When you have unclaimed tokens, your Vault potentially becomes a target for arbitrageurs (at the expense of other depositors in your Vault). We would recommend that you either claim them regularly or use a whitelist to prevent malicious actors.
Once you have claimed your rewards (in this case, COMP), the position won't update in your overview until either you do a trade or you receive a new deposit. However, your Vault's NAV will no longer be open to arbitrage until substantial rewards accrue.
If you think that you'll only be claiming rewards once a week, it might make sense to use an entrance fee to deter arbitrageurs.
External Positions
Using external positions requires substantially more trust by your depositors than other adapters. This is because redemptions might not always be possible if the Vault’s assets are tied up in external positions.
If you are depositing into a vault which is able to hold external managers, make sure that you take the necessary steps to know who the vault manager is and establish trust between you.
Pricing Risk
Fund owners and asset managers must be aware of the pricing mechanism assumptions and vulnerabilities involved in the assets they hold if their investors are unknown/untrusted entities. This is because a fund is potentially exposed to share price arbitrage to the extent that Enzyme's understanding of the value of its holdings deviates in value from what can actually be acquired by trading or redeeming those assets. 
In other words, one of the scenarios below could occur and cause a material impact to the real value held by your vault that is not immediately reflected in the price of your vault's shares.
Example: Wrapped or synthetic assets using a Chainlink price
With many wrapped assets (e.g., wBTC, cxDOGE, and Lido stETH) and potentially synthetic assets (none currently), the protocol assumes that the asset (e.g., wBTC) maintains a 1:1 price with its underlying (e.g., BTC).
In the case of wrapped assets, the underlyings are held in custody by a third party (e.g. Bitgo, in the case of wBTC, or the Lido smart contract in the case of stETH). If access to the assets is lost by the custodying entity (e.g., contract vulnerability or private key compromise), the protocol will continue to treat the wrapper as 1:1 with its underlying, even though its real value would be between 1 and 0.
The same would be true of a collateralized synthetic asset that became under collateralized.
A full list of assets where a 1:1 assumption is used will soon be available in documentation and the Enzyme app.
Example: Assets that rely on external protocol assumptions
For example, Curve stablecoin pools rely on the assumption that all assets in the pool are generally worth the same (this is a simplification but is directionally accurate). The price feed used for those tokens within Enzyme would become unstable if any of the assets in the pool lost its peg (which would lead to a "bank run" of sorts, imbalancing the Curve pool).
Example: Assets that rely on external protocol security
For example, the YearnVaultV2PriceFeed that is used for pricing yVault tokens relies on its yVault contract correctly reporting its value in a way that cannot be manipulated by price oracle manipulation attacks.
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Example: Wrapped or synthetic assets using a Chainlink price
Example: Assets that rely on external protocol assumptions
Example: Assets that rely on external protocol security