Privacy-preserving consensus mechanisms for anonymous decentralized social media: A blockchain-based paradigm for anonymity

The increase of decentralized social media systems provides them with liberty and openness, yettends to interfere with privacy because transaction data is made publicly accessible in blockchains.In this paper, a Privacy-Preserving Consensus Mechanism (PPCM) has been proposed as a privacy-preservingblockchain in anonymous decentralized social media systems. To preserve theconfidentiality and integrity of transactions, the PPCM incorporates the advanced cryptographysolutions, Zero-Knowledge Proofs (ZKPs), Homomorphic Encryption, and ring signatures. It utilizesa Decentralized Identity (DID) model of self-sovereign identity management and cross-platforminteroperability, and overlays a reputation-based layer of governance to encourage ethicalbehavior without disclosing the identity of users. Scalability is ensured with sidechains, whichremove high-frequency interaction points of the main blockchain to minimize latency. The model isa compromise between privacy and accountability and solves such issues as Sybil attacks, metadataleakage, and unethical use of anonymity. The PPCM offers a privacy-focused, scalable, and ethicallyregulated design of next-generation decentralized social media networks.