"We have also seen that cryptocurrencies are not amenable to definition as a currency, asset or commodity; they have no underlying cash flows, they have no intrinsic value; that they are akin to Ponzi schemes, and may even be worse,"
IRS disagrees.
"Cryptocurrency is a type of virtual currency that uses cryptography to secure transactions that are digitally recorded on a distributed ledger, such as a blockchain. A transaction involving cryptocurrency that is recorded on a distributed ledger is referred to as an “on-chain” transaction; a transaction that is not recorded on the distributed ledger is referred to as an “off-chain” transaction."