Use Cases

The Multi-Ledger Rollup introduces a new paradigm of interoperability by enabling assets and smart contracts from multiple, heterogeneous blockchains — both permissioned and permissionless — to operate within a shared execution environment. This unlocks a wide range of use cases, such as:

1. Seamless Cross-Network Token Interactions

Assets from permissioned (e.g. enterprise or consortium) and permissionless (e.g. Ethereum, Polygon) blockchain networks can natively interact within the rollup. Despite coexisting on the rollup, each asset retains its native chain anchoring — users can withdraw their tokens to their original Layer 1 (L1) chain at any time (via sending a transaction directly to the origin chain). This model preserves origin-chain trust while unlocking direct composability.

Example: A regulated asset from a permissioned Hyperledger Fabric network can be used as collateral in a DeFi protocol originating on Ethereum, all within the rollup.

How This Works Today

To accomplish this today, users must:

Use token bridges or custodial solutions to wrap the regulated asset.
Rely on oracles or relays to monitor state between chains.
Manually convert or collateralize assets on different platforms.

This results in significant latency, complex user flows, and security risks tied to bridges and off-chain trust assumptions.

Benefits of a Multi-Ledger Rollup Approach

The asset is natively recognized and secured via its origin chain.
No wrapping or bridging is needed.
The collateral can be used in the target protocol without bridging or wrapping, in a single compliant and auditable transaction.

2. Risk-Reduced Access to Public Liquidity

Tokens issued on permissioned blockchains (often representing regulated assets, such as CBDCs, bonds, or tokenized equity) can interact with liquidity from permissionless chains without compromising compliance. Rollup operators/sequencers (i.e. Quant) can enforce KYC and whitelisting rules (through Quant Connect) on accounts accessing such liquidity pools, ensuring regulated entities are shielded from exposure to unvetted parties.

Example: A whitelisted stablecoin holder from a permissioned blockchain network can swap against a USDC/ETH pool sourced from Ethereum, but only interact with verified liquidity providers.

How This Works Today

Currently, regulated token holders:

Are excluded from most DeFi liquidity pools due to KYC constraints.
Must rely on centralized exchanges (CEXs) or OTC desks to access liquidity.
Face limited market depth and increased counterparty risk.

Benefits of a Multi-Ledger Rollup Approach

Access to permissionless liquidity is possible while maintaining compliance guardrails.
Regulated actors can trade on-chain in a deterministic, trust-minimized way.
Liquidity is unlocked across previously isolated domains — with full auditability.

3. Cross-Chain Liquidity Pooling and Market-Making

Assets from multiple blockchains can be paired directly in liquidity pools on the rollup. This enables DEXs, lending platforms, and other primitives to operate on a truly cross-chain basis.

Example: A liquidity pool could be composed of a token from a Cosmos zone and another from an enterprise Corda network — priced and traded directly without wrapping or synthetic derivatives.

How This Works Today

To enable cross-chain liquidity pools:

Developers use wrapped tokens (e.g., wETH, renBTC).
Liquidity providers must split funds across bridges or different chains.
Complex off-chain price oracles are required to determine fair value.

Benefits of a Multi-Ledger Rollup Approach

Native tokens from multiple chains can be pooled directly.
Liquidity aggregation happens on-chain within a single execution environment.
Simplifies liquidity pool management and reduces risk from synthetic assets.

4. Unified Asset Representations Across Chains

The same token existing on multiple chains can be represented as a single canonical asset within the rollup. For example, rather than treating USDC on Ethereum, Polygon, and Solana as separate tokens, the rollup can merge these into one multi-ledger USDC, simplifying user and developer experience.

Example: A user deposits USDC from Polygon and receives the same fungible USDC asset as another user who deposited from Ethereum — creating a unified liquidity layer.

How This Works Today

Today, users and protocols must:

Track chain-specific variants of the same asset (e.g., USDC.e vs USDC).
Perform manual bridging and wrapping to unify liquidity.
Build complex routing logic in apps to determine which version to use.

Benefits of a Multi-Ledger Rollup Approach

A single canonical representation abstracts away chain complexity.
Improves interoperability between dApps.
Enables deeper, unified liquidity and simplifies asset management.

5. Synthetic Multi-Chain Tokens

Rollups can also synthesize new multi-ledger tokens from a basket of tokens on different chains. This can be used to create:

Multi-ledger stablecoins: Backed by stablecoins from various L1s (e.g. USDC + DAI + PYUSD from different chains)
Cross-chain gas tokens: A single token used to pay gas fees across networks (e.g. backed by ETH, POL and AVAX), settled and reconciled back to each chain transparently

Example: A user could use a unified stablecoin to interact with dApps across five blockchains without worrying about which L1 the backing token came from.

How This Works Today

Currently, users must:

Hold multiple stablecoins or gas tokens across chains.
Pay bridging fees and manage wallet fragmentation.
Monitor exchange rates and manually rebalance assets.

Benefits of a Multi-Ledger Rollup Approach

Users can transact with a single asset across chains, reducing overhead.
Improves UX, especially for retail and enterprise users.
Gas abstraction allows seamless dApp interaction without worrying about network-specific balances.

6. Multi-Party, Multi-Chain Smart Contract Composability

Developers can build smart contracts that ingest inputs and control tokens from multiple chains simultaneously. This enables novel applications like:

Global multi-chain DAOs
Cross-chain insurance protocols
Payment workflows spanning public and private networks

Example: A decentralized insurance protocol is deployed on the Fusion's Multi-Ledger Rollup. It accepts policy premiums in USDC from Ethereum, monitors real-time supply chain data recorded on a Hyperledger Fabric network, and pays out claims in stablecoins on Solana when a validated event occurs (e.g. shipment delay, damage report). The smart contract logic is executed atomically within the rollup, aggregating inputs from multiple chains and triggering a deterministic, trust-minimized outcome — without relying on oracles, cross-chain bridges, or manual reconciliation.

How This Works Today

To orchestrate multi-chain logic:

Developers build custom bridges, or use relay protocols.
Each contract leg must be deployed and executed separately, with delayed coordination.
Resulting logic is non-atomic, prone to race conditions and exploits.

Benefits of a Multi-Ledger Rollup Approach

Smart contracts can natively ingest and act on multi-chain inputs.
Logic is executed atomically, removing the need for external coordination.
Reduces complexity and ensures consistent outcomes.

7. Cross-Chain Arbitrage, Trading, and DeFi

With assets coexisting and settling on a shared rollup, arbitrage and cross-chain DeFi strategies become dramatically simpler, faster, and safer — no need for complex bridges, messaging protocols, or wrapped asset risks.

Example: A trader identifies a price discrepancy for SOL between two liquidity pools on the rollup: one sourced from Solana, and another from a regulated permissioned network. By leveraging Fusion’s shared execution environment, the trader can atomically swap SOL across these two pools without bridging or wrapping — enabling fast, low-risk arbitrage between ecosystems that would otherwise remain isolated.

How This Works Today

Arbitrageurs currently:

Need to bridge funds to each network manually.
Face multi-block latency, causing missed opportunities.
Must deal with fee fragmentation and slippage risk across chains.

Benefits of a Multi-Ledger Rollup Approach

Instant arbitrage within the rollup.
Removes inter-chain latency and simplifies execution.
Lower fees, less slippage, and minimal capital fragmentation.

Conclusion

A Multi-Ledger Rollup collapses the boundaries between blockchain silos, turning isolated networks into interoperable execution layers while preserving compliance, custody, and origin-chain integrity. By harmonizing token representation, liquidity access, and smart contract execution across chains, a Multi-Ledger Rollup unlocks a powerful design space for cross-chain finance, regulated DeFi, and hybrid Web3/Web2 enterprise use cases.