The address whose balance moved: the token account's owner.
Token units, scaled by the token's decimals. A mint that is no known token takes the decimals its Solana transaction reports (9 for lamports), else none.
The token's on-chain address.
The balances around the change, where the chain reports them (Solana).
Null for a mint that is no known token.
One address's balance change of one mint in an observed transaction.