Answer Posted / Nitish Bhardwaj

Verifying the validity of a block in a blockchain involves several steps:n1. Hash Check: Verifiers compare the block's hash with its parent block's hash to ensure that the block hasn't been tampered with.n2. Nonce Verification: Miners modify the nonce value until the block's hash meets the network's difficulty target, ensuring that the block is not invalid.n3. Merkle Tree Validation: In a Merkle tree structure (used in Ethereum), verifiers check the integrity of transactions by comparing transaction hashes at each level, starting from the leaf nodes until they reach the root hash of the block.

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