Although blockchains are systems that are intended to survive on their own, they still may need human intervention like other Parallel and Distributed Computing (PDC) architectures. The reasons for this intervention are twofold: management of blockchain nodes and governance of blockchain. The second focuses on sustaining blockchain unlike the first one concerning with operation of individual nodes. Proposed blockchain governance models so far include cumbersome processes in which deciding and deployment of changes rely on the involvement of multiple actors. They have been criticized from various aspects such as reducing the decentralized nature of blockchain. In this paper, we propose a novel on-chain governance model exploiting both policy-based management and decentralized identity technologies. Since it allows controlling the behavior of the system via higher level expressions that are easy to understand, the policy based management concept will fit in well with blockchain ecosystems having stakeholders from different knowledge levels. This model is not only more effective regarding existing off-chain governance models but also is simpler and more user friendly than other on-chain governance models. Besides, the emerging decentralized identity concept has the potential for solving many problems related to decision-making process of blockchain governance. By employing this concept, our approach fortifies decentralization, security and fairness while providing well-directed governance. The smart contract based modular design of our framework opens the door for adoption of its components by other governance models as well.

尽管区块链是旨在自行生存的系统，但它们仍可能需要人工干预，就像其他并行和分布式计算（PDC）架构一样。这种干预的原因有两个：区块链节点的管理和区块链的治理。第二个重点是维持区块链，而第一个不涉及单个节点的操作。到目前为止，提议的区块链治理模型包括繁琐的流程，其中决定和部署变更取决于多个参与者的参与。他们从各个方面受到批评，例如减少区块链的去中心化性质。在本文中，我们提出了一种新颖的链上治理模型，该模型同时利用了基于策略的管理和去中心化身份技术。由于它允许通过易于理解的更高级别的表达式来控制系统的行为，因此基于策略的管理概念将非常适合拥有不同知识水平的利益相关者的区块链生态系统。与其他链上治理模型相比，该模型不仅在现有链下治理模型上更有效，而且更简单，更用户友好。此外，新兴的去中心化身份概念具有解决与区块链治理决策过程相关的许多问题的潜力。通过采用此概念，我们的方法可加强分权，安全和公平性，同时提供有针对性的治理。我们框架的基于智能合约的模块化设计也为其他治理模型采用其组件打开了大门。