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Tanssi Deploys Final Testnet Before Mainnet: Appchains With Ethereum-Grade Infrastructure

  • Writer: Moondance Labs Team
    Moondance Labs Team
  • 4 hours ago
  • 4 min read

As Web3 infrastructure moves closer to real-world deployment, centralized rollups and RaaS platforms are hitting critical limits: centralized sequencers, rigid upgrade paths, and inherited governance models are holding back projects that need full control. From tokenized real-world assets (RWAs) to low-latency gaming and coordination protocols, teams are shifting toward dedicated infrastructure they can customize, govern, and scale.


But launching an appchain has traditionally taken 6–12 months and significant engineering effort—recruiting validators, setting up sequencers, wiring infra, and stitching tooling together by hand. Tanssi collapses that entire process into a permissionless coordination layer: spinning up sovereign, Ethereum-aligned appchains in minutes with infrastructure as a service.


With today’s final testnet launch, Tanssi enters its mainnet staging phase. All core systems are now live in a production-like environment—validator orchestration, decentralized sequencing, Ethereum-backed security, and trustless cross-chain messaging included.


Architecture Now Live


This testnet mirrors the architecture intended for Tanssi’s mainnet launch. It includes:


  • Symbiotic middleware contracts are live on the Sepolia Ethereum testnet, enabling permissionless operator onboarding, delegation, and slashing logic. These smart contracts plug Tanssi directly into Symbiotic’s core, ensuring seamless interoperability. A local instance of Snowbridge is also active, providing a fully trust-minimized, permissionless bridge between Ethereum and Tanssi. It uses on-chain light clients on both sides, so asset and message transfers inherit each L1’s native security, without relying on multisigs or permissioned custodians.

  • Tanssi’s Orchestration Chain is coordinating a rotating set of sequencers and validators, sourced from Symbiotic-registered operators.

  • A live Tanssi-powered chain is also active, testing EVM/Substrate runtime instantiation, execution flow, and validator lifecycle coordination.


End-to-End Architecture of a Tanssi-Powered Chain | Tanssi Network
End-to-End Architecture of a Tanssi-Powered Appchain

Together, these components enable deterministic execution, fast finality, and full-stack validation of what Tanssi will deliver at mainnet.


This testnet already supports Ethereum token transfers, validator rewards/slashing, and full end-to-end coordination. It’s the final step to validate network integrity, coordination logic, and production readiness ahead of mainnet.


Sovereignty, Finality, Security: Why Centralized Stacks Are Breaking Down


Most RaaS platforms trade speed for control—offering fast deployments, but locking teams into centralized sequencers, inherited governance, and rigid runtime constraints.


Builders don’t just want to launch quickly—they need deterministic performance, fast finality, and infrastructure they can trust to scale with app complexity. But standing up a sovereign chain has historically been slow, manual, and expensive—coordinating validators, setting up sequencers, and stitching together RPCs, indexers, and explorers.


Tanssi removes that friction.


This testnet is a complete dry run of Tanssi’s architecture:

  • Dedicated, decentralized execution environments, spun up in minutes

  • Ethereum-aligned security via restaking, rotating validator sets

  • Isolated infrastructure per chain—no noisy neighbors

  • Automated infra orchestration with fast finality and runtime flexibility


Tanssi gives teams what centralized stacks can’t: a fast path to full ownership—without compromising on decentralization, security, or operational sanity.


What Developers and Operators Can Do


This testnet is now onboarding early infrastructure participants and developers. In this phase:


  • Developers can deploy EVM or Substrate chains, configure execution parameters, and test runtime logic. Flashbox (Quick Trial Chain), a lightweight environment for quick and permissionless launches, remains available for open experimentation.

  • Operators can register through Symbiotic vaults on the Sepolia testnet to run validators and sequencers.

  • End users can test transfers and chains interactions. Bridging and cross-chain execution will roll out in later phases.


Upcoming upgrades will add support for external sequencers, staking logic, governance modules, and token movement across chains.


How We Got Here


This milestone follows over years of technical development, infrastructure validation, and ecosystem and community expansion:


  • Integrated with Symbiotic to enable permissionless validator onboarding and ETH-backed security.

  • Scaled the Dancebox test environment to 57 million transactions, with 18,000+ registered chains.

  • Moondance Labs, Tanssi core contributor, raised $10M+ from Arrington Capital, HashKey Capital, Borderless, Fenbushi, and Gavin Wood.

  • Built an ecosystem of 150+ projects across DeFi, RWA, enterprise, and gaming.

  • Built a 200,000-strong global community across 100+ countries.


Ecosystem Spotlight


Tanssi’s testnet is already powering diverse use cases:


  • Real World Assets (RWAs): BLOCKBR, BRX, and Scenium are launching RWA chains with compliance-grade security.

  • Gaming: Trexx is building real-time gaming on latency-sensitive infrastructure.

  • SocialFi & AI Coordination: Gotas uses NFTs and AI to enhance influencer interactions with their audience.


These teams aren’t using Tanssi for convenience—they’re using it because centralized infrastructure couldn’t meet their execution, governance, or security needs.


The Tanssi Ecosystem | Tanssi Network
The Tanssi Ecosystem: Infrastructure, Integrators, and Live Chains Ready for Mainnet

What Comes Next


This testnet is the final proving ground before mainnet—designed to validate every layer of the Tanssi stack in production-like conditions. What’s ahead:


  • Expanded Operator & Developer Access: Opening onboarding for new permissionless operators and enabling more teams to deploy sovereign chains.

  • Staking, Governance & Rewards: Support for on-chain staking flows, governance modules, and validator reward mechanics.

  • Tooling & DevX Enhancements: More out-of-the-box tools, improved runtime controls, and smoother onboarding for both Flashbox and production environments.


With these last pieces landing, Tanssi will be ready to bring fully sovereign, Ethereum-secured chains from testnet to mainnet—at scale.


Ready to build? Test it now at apps.tanssi.network.




About Tanssi 


Launch your appchain—in minutes, not months.

Tanssi equips developers to launch appchains with Ethereum-backed security—without infrastructure overhead. Built for use cases like RWAs, stablecoins, and coordination protocols, Tanssi automates the full stack: validator orchestration, decentralized sequencing, RPCs, indexers, and explorers—all provisioned out of the box. Teams can launch with a prebuilt EVM chain or customize a Substrate runtime, gaining deterministic performance, fast finality, and full control over governance, fees, and upgrade logic. The result: a sovereign chain, live fast—with no shared bottlenecks or external dependencies. Learn more at tanssi.network.

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