hash

Every block contains the hash of the previous block, forming a chain.每个区块都包含前一个区块的哈希值，从而形成一个链。

Any change to the block data produces a completely different hash, making tampering instantly detectable.对区块数据的任何更改都会产生完全不同的哈希值，从而使篡改行为能够被立即察觉。