Blockchain always links each block in backward order. In other words, blockchain links each block with its previous block.
In a blockchain, blocks are linked in a specific chronological order, forming a chain. Each block contains a reference to the previous block’s hash, creating a continuous and immutable chain of blocks. The order of linkage is from the genesis block (the first block in the chain) to the most recently added block. This ensures the integrity and security of the blockchain, as altering the data in any block would require changing all subsequent blocks, making the tampering attempt easily detectable.