What is Merkle tree?

It is a tree structure in which each leaf node is a hash of a block of data, and each non-leaf node is a hash of its children. Merkle trees are used in distributed systems for efficient data verification.

It is a very useful data structure to encode large amounts of data into very small hash representation.

Merkle.space is powered by the Stellar network. Stellar is an open global protocol for value transfer enabling low cost, high access and seamless multi-asset transactions.

References:
https://en.wikipedia.org/wiki/Merkle_tree
https://github.com/bitcoin/bitcoin/blob/
master/src/consensus/