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Algorand Specifications

A light block header is a structure containing a subset of fields from Algorand’s block header and the commitment of said block header.

Light block header contains the following components:

• The block’s seed, under msgpack key 0.
• The block’s hash, under msgpack key 1.
• The block’s genesis hash, under msgpack key gh.
• The block’s round, under msgpack key r.
• The block’s SHA-256 transaction commitment, under msgpack key tc.

The light block header commitment for rounds (X⋅δSP,…,(X+1)⋅δSP] for some number XX, defined as the root of a vector commitment whose leaves are light block headers for rounds X⋅δSP,…,(X+1)⋅δSP respectively.

The hash function SHA-256 is used to create this vector commitment.