After challenging the privacy guarantees of Bitcoin, a lot of alternatives have been proposed to enhance
the privacy-properties of Bitcoin. While Zcash (one of such alternatives) significantly improves
the privacy of Bitcoin, its two-coin design with a public base-coin permits critical attacks to happen.
In this paper we propose Oscausi, an anonymous payment system that supports practical confidential
and anonymous transactions without a public basecoin nor a trusted setup. The scheme is inspired
by the Lelantus and MimbleWimble schemes, joining the ideas into one system, with a confidential
basecoin and privacy through a shielded pool. Our proposal supports non-interactive transaction
aggregation across shielded and unshielded transactions. The scheme is built upon well-known cryptography,
is easily auditable and requires no trusted setup.