Yield is everything in crypto. In the coming months, you will see a proliferation of yield bearing ETFs. But, for ETH staking products, how do consumers know if they are being treated fairly? That's where CESR, the composite ether staking rate, comes in. Think of it like a "risk free" rate of ethereum. It captures the mean, annualized return across ethereum's ~1 million validators. Institutions generally outperform it by 20bps or so. Having benchmarks like CESR, administered by @QuatrefoilData, keep issuers honest.