A predicted confidential spending balance a proof is built against. Inside a
Batch, an earlier balance-mutating inner for the same (account, token) leaves
state the ledger does not yet reflect; prepareConfidentialBatch predicts
it and threads it into the next proof-bearing builder via confidentialState.
Standalone callers never set this — the builder reads live ledger state.
A predicted confidential spending balance a proof is built against. Inside a Batch, an earlier balance-mutating inner for the same
(account, token)leaves state the ledger does not yet reflect; prepareConfidentialBatch predicts it and threads it into the next proof-bearing builder viaconfidentialState. Standalone callers never set this — the builder reads live ledger state.