The University of SydneyPage 9The BlockchainabstractionLet G = ⟨B, P⟩a directed acyclic graph (DAG) where blocks B point to each other with pointers ⟨b0, b1⟩∈P is a pointer from current block b1 to previous block b0The pointeris a representation of a hash of the destination block that the source block containsThe genesis block is a special block known initially by all participantsDataPointer to DataHash of DataDataDataPointer to DataHash of DataDataPointer to DataHash of DataDataPointer to DataHash of DataGenesis BlockBlock 1Block 2Block 3Block 4