The rise of blockchain technology in digital marketplaces has been widely celebrated as a revolutionary shift toward transparent, decentralized, and consumer-empowering commerce. Yet this narrative often obscures deeper structural implications that challenge the idealized vision of a trustless digital economy. This study critically examines blockchain trust mechanisms as instruments that simultaneously enhance transparency while reinforcing new forms of techno-capitalist power, data extraction, and algorithmic governance. Through a conceptual analysis supported by interdisciplinary literature, the paper argues that blockchain does not inherently decentralize trust; rather, it reconfigures trust around code-based authority, platform governance, and corporate-controlled infrastructures. While immutable ledgers reduce fraud and information asymmetry, their permanence introduces new risks related to surveillance, digital identity tracking, and consumer behavioral profiling. The integration of blockchain into digital marketplaces creates a hybrid trust regime where decentralized protocols coexist with highly centralized economic actors, including global corporations, platform monopolies, and institutional investors. The findings reveal that blockchain-enabled transparency can be double-edged empowering consumers through verifiability while simultaneously intensifying capitalist logics of auditability, data commodification, and market discipline. The study concludes that blockchain is less a tool of consumer liberation and more a technological evolution of surveillance capitalism, embedding trust not in democratic decentralization but in cryptographically enforced compliance. The paper calls for critical governance frameworks that address the social, ethical, and political economy implications of blockchain-based digital marketplaces..