  This paper presents Adamastor, a new low latency and scalable decentralized
anonymous payment system, which is an extension of Ring Confidential
Transactions (RingCT) that is compatible with consensus algorithms that use
Delegated Proof of Stake (DPoS) as a defense mechanism against Sybil attacks.
Adamastor also includes a new Decoy Selection Algorithm (DSA) that can be of
independent interest, called SimpleDSA, a crucial aspect of protocols that use
ring signatures to anonymize the sender. SimpleDSA offers security against
homogeneity attacks and chain analysis. Moreover, it enables the pruning of
spent outputs, addressing the issue of perpetual output growth commonly
associated with such schemes. Adamastor is implemented and evaluated using the
Narwhal consensus algorithm, demonstrating significantly lower latency compared
to Proof of Work based cryptocurrencies. Adamastor also exhibits ample
scalability, making it suitable for a decentralized and anonymous payment
network.
