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This study addresses the limitations of conventional incentive systems in encouraging sustainable behaviors -- such as donations, ethical consumption, and CO2 reduction -- by highlighting their lack of transparency, long-term viability, and respect for privacy. To overcome these issues, we propose a decentralized reward framework built upon a blockchain-based Self-Sovereign Information Environment (SSIE). Verified actions are recorded through NFTs and smart contracts, ensuring immutable traceability without disclo...