====== Delegated Byzantine Fault Tolerance (dBFT) ======
[[dido:public:ra:xapend:xapend.k_consensus:02_mechanism:start | Return to Consensus Mechanism ]]

**Delegated Byzantine Fault Tolerance (dBFT)** is a sophisticated algorithm meant to facilitate consensus on a [[dido:public:ra:xapend:xapend.a_glossary:b:blockchain|blockchain]]. Although it is not in common use as of yet, it represents an alternative to simpler [[dido:public:ra:xapend:xapend.a_glossary:p:proof_of_stake_pos|proof of stake]], proof of importance, and [[dido:public:ra:xapend:xapend.a_glossary:p:proof_of_work|proof of work]] methods.
[[https://www.techopedia.com/definition/33598/delegated-byzantine-fault-tolerance-dbft]]

**Delegated Byzantine Fault Tolerance (dBFT)** consensus was introduced by NEO, often called the //“Ethereum of China”//. This Chinese blockchain plans to achieve the “smart economy” by digitizing assets and providing smart contracts on the blockchain.

According to its creators, the voting system of dBFT allows large-scale participation, in a similar way to the Delegated Proof-of-Stake consensus. This allows the holder of a NEO token to support a specific ‘bookkeeper’ through a vote. The selected group of bookkeepers then use the [[dido:public:ra:xapend:xapend.a_glossary:b:byzantine_fault_tolerance|Byzantine Fault Tolerance]] mechanism to reach a consensus and generate more blocks.

One of the strongest points of using the dBFT mechanism is its absolute finality. After final [[dido:public:ra:xapend:xapend.a_glossary:c:confirmation|confirmation]], a block can not be bifurcated, so the transaction can’t be revoked or rolled back. However, this irrevocability is a two-edged sword if and when a bifurcation is needed. 

The finality of dBFT is somehow guaranteed because NEO is not a wholly distributed network. Despite NEO’s efforts to take this direction, there are currently just seven nodes and a few delegates operating on the blockchain. The majority of these are connected to the NEO council.((
Christina Comben,
Coin Rivet,
14 March 2019,
Accessed 18 July 2021,
[[https://coinrivet.com/delegated-byzantine-fault-tolerance-dbft-explained/]]))

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