It is outlined that an attacker, referred to as Mallory, can compromise privacy by controlling these servers. Specifically, if Mallory controls the filter server and creates a transaction paying to themselves, they can manipulate the system to target a victim’s SP address using alternative transactions with the same inputs. This scenario underscores the criticality of server control in privacy breaches.

Moreover, the text elaborates on different levels of privacy assurance provided by various methods of accessing blockchain data. While regular audits of servers returning tweak data, filters, and simplified UTXOs (Unspent Transaction Outputs) are suggested to offer a comparable level of privacy to direct P2P network data access, this assertion is challenged. The critique is based on the notion that audits can only verify past honesty, leaving recent victims vulnerable. The public availability of tweak data and simplified UTXOs theoretically allows for independent verification, although practical challenges such as blockchain reorganizations (reorgs) complicate this process.

Furthermore, the communication explores sophisticated attack strategies against Bitcoin users. These include both inexpensive and costly approaches to reveal the network identity of a victim by manipulating transaction data. Among these, a noteworthy method involves generating legitimate blocks that contain transactions specifically designed to match a target wallet, thereby compromising the victim's privacy without immediate detection. Additionally, a variation of the dust-spamming attack is mentioned, where small amounts of Bitcoin are sent to targeted addresses to monitor the download patterns of related block data, thus inferring control over specific addresses.

The importance of employing protective measures against such privacy attacks is emphasized. Utilizing BIP158 compliant clients, preferably with ephemeral Tor identities, is recommended to enhance user privacy. Ultimately, operating a full node is presented as the most effective solution for ensuring privacy, owing to its inherent design that obfuscates the association between network operations and wallet transactions, achieving what is described as "information theoretic perfect privacy."