With “Valuable” I meant that a lot of value is on-chain (in terms of market cap or transactions - basically whatever makes it worth stealing it).
Nobody would bother mounting an attack on some random shitcoin, so it can be secure (for all practical purposes) without wasting massive amounts of energy.
A public blockchain that carries a lot of value must burn a significant proportion of available hash power to guard against interference, so it’s either wasteful or insecure.
That makes sense, but I still don't think you want "valuable." In practice, most of the value of real economic systems is not held in money, but in assets. In the crypto universe, Bitcoin is more of an asset than a currency (although a valueless one if you don't consider it a currency). All you need now is a good currency.
Nobody would bother mounting an attack on some random shitcoin, so it can be secure (for all practical purposes) without wasting massive amounts of energy.
A public blockchain that carries a lot of value must burn a significant proportion of available hash power to guard against interference, so it’s either wasteful or insecure.