Weak Subjectivity Definition
Weak Subjectivity is a security model utilized in Proof-of-Stake (PoS) blockchain networks. It implies that a node attempting to validate the network state may need to rely on external or subjective information to confirm the status of the blockchain, as certain data may not be directly evident from the blockchain’s established protocol or consensus rules.
Weak Subjectivity Key Points
- Used in PoS networks to validate the current state of the network
- Nodes may operate based on external ‘subjective’ information, not just the blockchain’s protocol
- Provides a layer of adaptability and resilience against specific security threats
- Contrasts with the ‘Strong Objectivity’ model
What is Weak Subjectivity?
Weak Subjectivity is a concept originating from the premise that blockchain networks, particularly PoS networks, require a balancing act between objective and subjective methodologies for validation. This mixture of objective and subjective consensus rules is known as ‘Weak Subjectivity’. It acknowledges that while a large part of the network operations are governed by the protocols and consensus rules embedded within the blockchain code, there may be factors which are external (or subjective) and could influence the state of the network.
Why is Weak Subjectivity important?
Weak Subjectivity is crucial as it allows the network to adapt beyond rigid protocol rules, enabling a more flexible response to potential security risks such as long-range attacks. In a strong objectivity model, for example, a malicious actor could potentially build an alternative chain in secrecy and later present it as the ‘real’ chain to new users. Weak Subjectivity takes into account externalities and constantly evolving network conditions, which can help to actively exchange information about the subjective state of the network.
Who does Weak Subjectivity affect?
Weak Subjectivity essentially affects all the participants in the network, from developers to users and validators. Developers need to be mindful of this concept when designing blockchain systems, while users and validators must remain vigilant and informed about the real-time state of the network to maintain its security and integrity.
When does Weak Subjectivity come into play?
Weak Subjectivity comes into play during the validation process in PoS networks. For instance, when a new node wants to join the network or during security threats, the node might need to rely on external resources to ensure it’s synchronizing with the correct version of the blockchain.
How does Weak Subjectivity work?
In practice, Weak Subjectivity checks might involve nodes cross-checking blockchain information with trusted peers or referencing widely accepted blockchain snapshots. This subjective information ensures that nodes have the correct understanding of the network and can help thwart attacks planned to mislead them. It’s like seeking a second opinion to validate certain conditions, which can be especially critical in dynamic and decentralized environments like PoS networks.
