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Algorand Specifications

The previous hash is a cryptographic hash of the previous block header in the sequence of blocks.

The sequence of previous hashes in each block header forms an authenticated, linked-list of the reversed sequence.

Let Br represent the block header in round r, and let Hash be some cryptographic hash function.

Then the previous hash in the block for round r+1 is Prevr+1=Hash(Br).

In the reference implementation, Hash is the SHA512/256 hash function.