TABLE 1.

Blockchain types

	UTXO	Account	DAG	Platform	Cryptocurrency	Private	Public
Bitcoin	✓				✓		✓
ZCash	✓				✓		✓
Monero	✓				✓		✓
Ripple		✓		✓		✓
Ethereum		✓		✓			✓
IOTA	✓		✓	✓		✓

Note: The private/public columns indicate block mining permissions. IOTA and Ripple are maintained by consortiums that own the mining rights. Many projects (such as Ripple and IOTA) developed smart contract functionality many years after their launch. Although IOTA uses a directed acyclic graph instead of a canonical blockchain, the IOTA transaction model is UTXO based. Privacy coins Monero and Zcash use UTXO models with cryptographic security.