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https://etherscan.io/address/0x00000000219ab540356cbb839cbe05303d7705fa https://etherscan.io/address/0x00000000219ab540356cbb839cbe0... shows the current total

https://etherscan.io/address/0x00000000219ab540356cbb839cbe05303d7705fa https://etherscan.io/address/0x00000000219ab540356cbb839cbe0... shows the current total value staked for ETH2 at about $10B USD (4M ETH); 51% is $5.1B USD (2M ETH) with around 115M ETH in existence. Aave has about 0.6M ETH available to loan out at 0.76% APR (https://app.aave.com/reserve-overview/ETH-0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc20xb53c1a33016b2dc2ff3653530bff1848a515c8c5 https://app.aave.com/reserve-overview/ETH-0xc02aaa39b223fe8d...) This is about a 0.01% interest rate per hr (8760 compound periods per yr) https://www.calculatorsoup.com/calculators/financial/periodic-interest-rate-calculator.php https://www.calculatorsoup.com/calculators/financial/periodi... Assuming the rest of the (1.4M) ETH to be staked could be obtained by loaning and converting from other staked Aave assets currently totaling at around $7.5B USD for the same rate and same period, then the interest fee for a 1 hr 2M ETH loan is: $5.1B USD * 0.0001 = $5(10)K USD. Over 50 hedge funds have the $6.375B USD or more in assets (https://www.pionline.com/interactive/largest-hedge-fund-managers-2020 https://www.pionline.com/interactive/largest-hedge-fund-mana...) that could provide for Aave's max LTV of 80% to borrow the $5.1B USD of ETH. Alternatively, a PoW attack on ETH assuming NiceHash, which currently only has 7% of the total ETH hash rate available, rates for 1 hr is ~$2M USD (https://www.crypto51.app https://www.crypto51.app note out of date figures). So, relatively the current ETH2 PoS attack cost is around 4 times smaller than the ETH PoW attack cost or an absolute difference of about $1.5M USD, which seems like a drastic difference in cost, but YMMV, especially considering your relationship with Cardano.

potiuper 5y ago
Another case considering the requirement that the existing 51% could not be loaned would require just over doubling the outstanding staked assets, which is more than Aave's current $7.5B available to loan, to a total staked ETH2 of $20B USD again assuming no previously controlled stake. But, assuming the same the interest rate, the fee for a 1 hr 4M ETH loan is: $10B USD * 0.0001 = $1M USD. Still, half the amount compared to the PoW.

potiuper 5y ago

Another case considering the requirement that the existing 51% could not be loaned would require just over doubling the outstanding staked assets, which is more than Aave's current $7.5B available to loan, to a total staked ETH2 of $20B USD again assuming no previously controlled stake. But, assuming the same the interest rate, the fee for a 1 hr 4M ETH loan is: $10B USD * 0.0001 = $1M USD. Still, half the amount compared to the PoW.