Hi,
XTRABytes use the Proof-of-Signature (PoSign) consensus algorithm.
But which one is better?
Proof of work
Proof of stake
Proof of Signature
Proof of signature looks good but it this true?
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In all other existing blockchain technologies, transactions are verified and blocks created by only one randomly selected node in the network. Common consensus algorithms such as Proof-of-Work, Proof-of-Stake, and Proof-of-Importance attempt to ensure that the node selected is not malicious or faulty, but they cannot guarantee that this is the case.
PoSign comprises a radically different approach. Transactions are verified by a network of what are called STATIC nodes—importantly, each of these nodes must sign off on a transaction before the associated block can be appended to the chain. Should a malicious node repeatedly attempt to compromise the chain, it will be blacklisted automatically.
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See also
https://bitcointalk.org/index.php?topic=1864397.0