The year 2025 marked a transformative period for the Logos Blockchain, as the project evolved from research and specification to implementation and public engagement. Formerly known as Nomos, the blockchain component of the Logos technology stack achieved critical milestones across its core architectural layers, culminating in a complete specification set and substantial progress toward testnet deployment.

In December, the Logos Blockchain team gathered together on the sunny coast of southern Spain, working together to crack the blockchain’s final unsolved problems. After a week of collaborative effort, the team made important strides in getting the blockchain ready for testnet and integrating support for the LSSA execution environment. The progress made in 2025 has prepared the Logos Blockchain for several public testnet launches in 2026, building up to a mainnet launch in early 2027.

Major Achievements

Architecture and Specifications Finalised

A defining achievement of 2025 came in August with the crystallisation of the Logos Blockchain architecture, with all its design details finally settled. This enabled the finalisation of the complete Logos Blockchain specification set. This comprehensive collection of documents fully describes the state of the Logos Blockchain as it will exist in its initial mainnet launch and serves as a definitive reference for both internal development and external communication. The completion represented the culmination of eighteen months of intensive research and protocol design, marking a transition from the research phase to focused implementation.

The specifications covered every aspect of the system with the technical precision necessary to support third party audits and implementations of the Logos Blockchain. While more accessible documentation for the Logos Blockchain is currently in the works, the official specifications are intended to serve as the source of truth for the entire project.

Sovereign Zone Prototypes Functional

Perhaps the most crucial progress on the Logos Blockchain came through the Sovereign Zones work. During the Croatia offsite in April, multiple teams created functioning prototype Sovereign Zone applications, including a zkEVM rollup with state transitions verified by light clients. These prototypes transformed Sovereign Zones from a theoretical concept into a tangible reality, validating the project's technical approach and its potential for real-world applications.

Parallel to the development of the blockchain, a dedicated execution environment for Logos applications was built over the course of 2025. Known as Logos State Separation Architecture (LSSA), it supports smart contract programs and a dual account model with both public and private transfers. At the offsite in Spain, we built a sequencer prototype to test end-to-end Sovereign Zone interactions. LSSA is the first Sovereign Zone to ship on the Logos Blockchain, and will serve as the primary home for Logos applications, relying on Bedrock for consensus and data availability.

Tokenomics and Incentive Structure Designed

The economic model for the Logos Blockchain evolved substantially throughout 2025, integrating market research and simulation results to design incentive structures for the blockchain. August marked a watershed moment with the establishment of a complete tokenomics framework with detailed block rewards and execution markets. Analyses of minimum stake estimation for the Service Declaration Protocol and block reward evaluations provided critical inputs for protocol implementation decisions.

The Service Declaration Protocol also matured in 2025 as the team refined requirements for role declaration, session tracking, and activity verification. The Service Reward Distribution Protocol developed in parallel, with the design updated to incorporate session tracking information, locked note identifiers, and snapshot computation. By November, Service Participation rewards had been fully implemented in the ledger and SDP implementation was close to complete, advancing the registration and incentive structure for service providers across the network.

Mantle Updates and Development

The Mantle execution layer underwent substantial evolution throughout 2025, adapting to new requirements and architectural decisions. The specification work initiated in February culminated in June with the finalisation of the Mantle specification and its integration with updated ledger structures. This included the introduction of Mantle Channels - permissioned virtual blockchains used to keep track of Sovereign Zone state updates.

A pivotal decision made during the April offsite reshaped the Mantle's design. The Architecture workgroup introduced a leadership lottery that preserves winner anonymity without requiring hidden note information, which led to a complete redesign of the Mantle to exclusively support public notes. Later in the year, the focus of the team’s efforts shifted to supporting Sovereign Zones in preparation for mainnet, while Native Zones sharing a common ledger were left for a future release.

Development efforts accelerated in the second half of the year, with transaction framework improvements and mempool enhancements. By October, service membership tracking had been migrated into the ledger to simplify reward distribution, and invalid transaction handling was introduced to prevent disruptions to block production. The Mantle had evolved from a conceptual layer to a functional execution layer for Bedrock Service operations and Sovereign Zone updates.

Anonymity Analysis and Blend Network Implementation

The Blend Network, Logos Blockchain's privacy-preserving communication service, achieved significant milestones throughout 2025. Early research in January focused on analysing communication reliability and anonymity failure probabilities, with the team modelling communication on trees. The latter informed subsequent development decisions.

February brought key advancements in economic incentives and the creation of a calculator to determine the likelihood of deanonymisation. In June, the final design of the Blend Protocol was set in stone. It included a message encapsulation system with cryptographic validation, session tracking, and a refined core-edge network architecture with a dedicated proxy service to manage communication between edge and core nodes.

Engineering efforts accelerated through the fall, with September bringing the integration of Proof of Quota and Proof of Selection, along with enhanced session transition logic for core services. An ongoing cryptography audit uncovered several fixes to the protocol’s cryptographic implementation.

Goals for 2026

With the design of the Logos Blockchain’s components now fully fleshed-out and with implementation efforts well underway, most of the hard work is already done. Most of what remains is to add some finishing touches to the implementation and to fix any issues uncovered in rounds of testing and code audits. Some new features for Sovereign Zones are planned for 2026, including support for decentralised sequencing, bridging, and inter-Zone messaging.

The year’s initial effort will be to prepare the Logos Blockchain for a public testnet launch in March of 2026. This initial testnet will feature a working prototype of the Logos Blockchain integrated with the other components of the Logos technology stack, allowing members of the community to stress-test the product. After that, work will continue on integrating fixes and improving the network’s resilience in preparation for another testnet in June 2026. The last quarter of 2026 will focus on preparing the Logos Blockchain for the initial mainnet launch, currently expected in early 2027.

Conclusion

The year 2025 represented a pivotal chapter in the journey of the Logos Blockchain, transitioning from a theoretical, isolated architecture to a practical implementation integrated with other components of the Logos Stack. With comprehensive specifications finalised, functional prototypes demonstrated, and core protocols approaching completion, the project has established a solid foundation for its 2026 testnet launches. The collaborative efforts across architecture, execution environments, economic design, and privacy infrastructure have converged into a coherent system ready for rigorous testing and refinement. As the team enters 2026, the path to mainnet is clear, with each milestone bringing the vision of a sovereign, privacy-preserving blockchain infrastructure closer to reality.