Oui c'est une des premières implémentations du tangle ou Directed Acyclic Graph (en Français Graphe orienté acyclique).

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The design

There are no blocks in Byteball, and no block size issue.  Instead, every new transaction references one or more earlier ones (parents) by including and signing their hashes.  The links among transactions form a DAG (directed acyclic graph):



By including its parents, each new transaction also indirectly includes and confirms all parents of the parents, parents of the parents of the parents, and so on.  As more transactions are added after your transaction, the number of confirmations you receive grows like snowball, that’s why the name Byteball (our snowflakes are bytes of data).

Consensus

There is no PoW, no PoS, and no mining.  Instead, we have the DAG, which already establishes partial order between transactions, plus we add the main chain within the DAG:



The main chain (MC) allows to define total order between transactions: the transaction which gets included (directly or indirectly) earlier on the MC, is deemed earlier in the total order.  When there is a double-spend, the version of the transaction that comes earlier in the total order is deemed valid, all others are deemed void.

The main chain is defined deterministically based on the positions of transactions in the graph.  Refer to the white paper for details, but as a general rule, the MC gravitates towards transactions authored by well known users, which we call witnesses.  The list of witnesses is defined by users themselves as they include the list in every transaction they post.  The MC then follows the path within the DAG such that:
1. the witness lists of the neighboring transactions on the chain are either identical or differ by only one mutation,
2. the chain goes through the most number of witness-authored transactions, compared with alternative chains.

The above is very brief and sketchy description with many important details omitted, refer to the white paper for a full technical story.

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Aucune altcoin même très innovante n'a jamais fait la moindre ombre au Bitcoin.