Right on point distinction. There are various models:
- almost all CBDC designs are transparent (monitored and stored), since they sit on the ledger and has to be auditable by a third party. So, the only way to allow privacy is to give some „vouchers“ that those transactions are either not stored or stored with a different key. ECB has proposed one such designs, e.g. 300 euro vouchers a day.
- there are other models that do not use DLTs so they can provide means not to store specific txns, hence private.
- almost all CBDC designs are transparent (monitored and stored), since they sit on the ledger and has to be auditable by a third party. So, the only way to allow privacy is to give some „vouchers“ that those transactions are either not stored or stored with a different key. ECB has proposed one such designs, e.g. 300 euro vouchers a day.
- there are other models that do not use DLTs so they can provide means not to store specific txns, hence private.
If stored, it can be audited.