Merkle Patricia Trie
Estrutura de dados híbrida no Ethereum combinando árvores Merkle e Patricia tries.
Combina Merkle [Tree](/pt/terms/merkle-tree) (para integridade) e Patricia Trie (para buscas). Permite ao Ethereum armazenar o estado global (saldos, código) à prova de violação. Cada cabeçalho de bloco contém o hash raiz.
graph LR
Center["Merkle Patricia Trie"]:::main
Rel_ethereum["ethereum"]:::related -.-> Center
click Rel_ethereum "/terms/ethereum"
Rel_merkle_tree["merkle-tree"]:::related -.-> Center
click Rel_merkle_tree "/terms/merkle-tree"
Rel_data_structure["data-structure"]:::related -.-> Center
click Rel_data_structure "/terms/data-structure"
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❓ Perguntas frequentes
Why does Ethereum use this instead of a regular Merkle Tree?
Because Ethereum's state changes constantly, and a Patricia Trie is more efficient for updating and looking up specific keys.
Is this different from a Merkle Tree?
Yes, it's a hybrid. It adds the 'path' compression of Patricia Tries to standard Merkle Trees.
Where is it stored?
It is stored in Ethereum's LevelDB database, with the root hash included in every block header.
📚 Fontes
2. Ethereum