> Blocks hold batches of valid transactions that are hashed and encoded into a Merkle tree.
─ [Blockchain - Wikipedia](https://en.m.wikipedia.org/wiki/Blockchain)
> Blocks hold batches of valid transactions that are hashed and encoded into a Merkle tree.
─ [Blockchain - Wikipedia](https://en.m.wikipedia.org/wiki/Blockchain)
Define Merkle tree, please