Threshhold Signature Scheme (TSS)

Threshold Signature Scheme (TSS) in Webb Protocol: Enhancing Bridge Governance


The Threshold Signature Scheme (TSS) plays a critical role in the Webb Protocol, an ecosystem for cross-chain and private dApps. One of the core components of the protocol is the private and multi-chain Hubble bridge, which facilitates seamless interoperability between different blockchains. In this document, we explore the problem that TSS solves and its significance in enhancing bridge governance specifically within the Webb Protocol ecosystem.

Bridge Governance

Bridge governance presents a challenge when it comes to updating the state of bridge contracts with the corresponding parties on the other side of the bridge. Traditional approaches rely on trust in a single entity or a small group of participants to execute these updates. However, this centralized approach raises concerns regarding security, integrity, and potential manipulation of the bridge's state.

Solution: Decentralizing Trust with Threshold Signature Scheme (TSS)

The Webb Protocol addresses the challenge of bridge governance by leveraging the power of the Threshold Signature Scheme. TSS decentralizes trust and introduces a robust mechanism for executing updates to the set of bridge contracts across different chains.

Let's delve into the key advantages and improvements offered by TSS in the Webb Protocol context:

  1. Enhanced Security:

    • TSS utilizes a threshold of signatures (t+1) from a participating group of (t,n) parties.
    • This distributed approach significantly reduces the risk of a single point of failure, collusion, or malicious behavior.
  2. Decentralization and Trustlessness:

    • TSS enables the Webb Protocol to achieve a decentralized bridge governance model.
    • The (t,n) threshold can accommodate a large number of participants, ensuring a diverse and decentralized network of validators and signers.
  3. Resilience to Attacks:

    • TSS mitigates potential attacks, such as collusion or compromise of a single party.
    • As long as the minimum threshold (t) is met, the system remains secure and resilient.
  4. Scalability and Flexibility:

    • The flexibility of TSS allows the Webb Protocol to adapt and scale according to its evolving needs.
    • The (t,n) threshold can be adjusted within certain limits to strike a balance between decentralization and performance.


The incorporation of the Threshold Signature Scheme (TSS) within the Webb Protocol's bridge governance brings significant improvements in terms of security, decentralization, and resilience. TSS enables the protocol to execute updates to bridge contracts with the involvement of multiple parties, thereby decentralizing trust and mitigating risks associated with centralized approaches. By leveraging TSS, the Webb Protocol paves the way for a more secure and trustless environment specifically for cross-chain dApps, empowering users and fostering innovation in the blockchain space.