Table 6.

Blockchain and Tangle comparison.

Blockchain	Tangle
Blockchain is comprised of a series of nodes, or blocks of transactions, each one appended to the previous one in a long regularly-developing chain. It can loop back in circular fashion.	Tangle is comprised of a group of data nodes that only flow in a single direction. It can never loop back.
Decentralized with semi-distributed ownership.	Decentralized with truly distributed ownership.
Blockchain boasts a significant level of security, due to its block-formation process, which includes the solution of a mathematical problem and verification through group consensus.	Tangle only requires that a device validate and approve two previous transactions before it can finish one of its own and accordingly create a data node. This less-robust procedure renders the tangle less secure than blockchain.
Transaction speed declines as the network increases in size as more transactions compete for limited block spaces. This makes blockchain consume high computational power.	Tangle scalability increases as the number of users increases, which makes it lightweight; in turn, it requires low computation power.
High power leads to high energy requirements.	Low power consumption leads to less energy requirements.
Blockchain takes approximately 10 minutes to confirm a transaction, which makes it not scalable.	Since it has low overhead PoW, it is faster, which makes it more scalable in comparison to blockchain.
Miners take transaction fees.	Since there is no concept of miners, there are no transaction fees associated.
Not quantum resistant because it uses elliptic curve signature scheme.	Quantum computing protection because it uses hash based signatures.