Merkle Tree Root = Hashed ( H5 + H6 ) ↑ H5 + H6 ( concatenated ) ↑ ↑ H5 = Hashed ( H1 + H2 ) H6 = Hashed ( H3 + H4 ) ↑ ↑ H1 + H2 ( concatenated ) H3 + H4 ( concatenated ) ↑ ↑ ↑ ↑ H1 = Hashed ( Tx1 ) H2 = Hashed ( Tx2 ) H3 = Hashed ( Tx3 ) H4 = Hashed ( Tx4 ) ↑ ↑ ↑ ↑ Tx1 Tx2 Tx3 Tx4