Solieum: an optimistic rollup Layer 2 for Solana
Solieum executes transactions off-chain in a Solana Virtual Machine environment and settles them on Solana, giving high-volume DeFi, GameFi and trading applications a dedicated execution layer with permissionless exits back to the base chain.
- BitAzure role
- Protocol architecture, rollup and settlement engineering, on-chain programs, bridge, explorer and developer tooling
- Website
- solieum.com
Problem
Solana applications compete for the same base-layer block space. During periods of heavy activity, congestion raises fees and delays confirmations for everyone. Solieum needed a Layer 2 that keeps the Solana programming model and wallet compatibility developers already know, while moving execution off the main network without asking users to trust a single operator.
Architecture
Solieum is an optimistic rollup. Transactions are submitted, ordered and executed off-chain, their data is published, batches are committed to Solana with a challenge window, and results either settle or can be exited by proof. Five programs deployed on Solana handle settlement, sequencer bonding, dispute resolution and data availability. Exits are permissionless and do not depend on sequencer cooperation. The bridge program provides a forced-inclusion entry path for deposits and proof-based withdrawals with guardian safeguards and a configurable payout delay. Batching amortises settlement costs across many transactions.
Solution
BitAzure engineered the rollup pipeline and the on-chain program set, the sequencer and data-availability services, the bridge with forced inclusion and proof-based exits, a block explorer, and the Solve development framework so that programs written in CradleScript compile to the SVM environment. A published compatibility matrix documents where the environment diverges from Solana mainnet so teams can port existing programs with confidence.
Features
- SVM execution environment compatible with standard Solana client tooling and wallet formats
- Five-stage pipeline: submit, order and execute, publish data, commit and challenge, settle or exit
- Settlement, sequencer bonding, dispute resolution and data-availability programs on Solana
- Permissionless exit mechanism independent of the sequencer
- Bridge with forced-inclusion deposits and proof-based withdrawals guarded by a payout delay
- Block explorer and published SVM compatibility matrix
- Solve framework and CradleScript for program development
Outcomes
- Beta devnet chain completed with all committed roots finalised; gamma devnet chain active
- Testnet in progress, with mainnet beta and progressive decentralisation planned
- Developers can target the rollup with existing Solana tooling rather than a new SDK
More reference projects
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