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# Algorand Specifications

The round or _round number_ is a 64-bit unsigned integer that indexes into the sequence of states and blocks.

The round rr of each block is one greater than the round of the previous block (ri=ri−1+1ri=ri−1+1).

Given a Ledger LL, the round of a block _exclusively_ identifies it.

The rest of this document describes components of states and blocks with respect to some implicit Ledger. Thus, the round exclusively describes some component, and we denote the round of a component with a subscript. For instance, the timestamp of state/block rr is denoted trtr.