Smart contracts on Blast can earn yield on the native ETH that they hold. This feature however is opt-out by default on smart contracts in order to maintain as much as possible backward compatibility with code that may rely on the ETH balance to not change. In the case of Blast, yield is gained through ETH itself, as it is a rebase token.

The BTB contract does not call any of the required function to activate yield generation, as such it will lose any potential rewards for the ETH held in it.

There are two ways of accruing yield for a smart contract:

• Automatic: native ETH balance rebases (increasing only)
• Claimable: ETH balance never changes; yield accumulates separately

Each of the above methods requires different function calls to the Blast yield contract. More on the mechanism of yield generation on the docs.blast.io page.

Modify the BTB contract to use one of the two methods of accruing and claiming native yield.