The total underlying cryptocurrency in a blockchain is calculated by summing:

Circulating Supply – Coins currently in circulation.

Locked or Staked Coins – Coins held in smart contracts or staking mechanisms.

Unmined Coins – Predefined future supply (if applicable, e.g., Bitcoin’s capped supply).

It excludes burned or permanently lost coins. The calculation is based on the blockchain's protocol rules and publicly verifiable ledger data.