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New case study out: Lagoon + Credible Layer on @LineaBuild
@turtledotxyz's @lagoon_finance integrated 5 assertions protecting their tokenized private credit vaults across sync/async settlement modes.
Here's what we built together 🧵
Jan 29, 2026
New dApp using the Credible Layer on @LineaBuild!
@turtledotxyz's @lagoon_finance vaults now have 5 assertions live to prevent NAV manipulation, epoch settlement attacks, and accounting drift across sync/async modes.
Linea drops any transaction that invalidates these assertions, preventing these hacks before they happen.
Read the full blog here:
Turtle enables tokenized access to private credit through Lagoon vaults that operate in two modes:
Synchronous: instant deposits when NAV is fresh
Asynchronous: epoch-based settlement when NAV needs updating
Dual-mode architecture = complex state transitions.
The Credible Layer introduces assertions: functions that define invalid states and prevent them at the network level, making it nearly inescapable.
Core concept:
Assertion: State → {true (safe), false (hack)}
Hack state → transaction rejected by Linea's sequencer.
Assertion 1: Total Assets Accounting Integrity
Monitors vault's totalAssets (NAV) across all settlement operations.
Enforces exact expected deltas: deposits increase totalAssets by pendingAssets, redemptions decrease by withdrawn amounts.
Maintains solvency: vault balance ≥ all claimable redemptions.
Assertion 2: Synchronous Deposit Mode Integrity
Enforces strict mutual exclusivity between sync and async modes based on NAV expiration.
When isTotalAssetsValid() = true: only syncDeposit() works
When NAV expires: only async (epoch-based) works
Prevents mode confusion arbitrage.
Assertion 3: Epoch Settlement Ordering and Claim-ability
Validates epoch-based settlement system with strict odd/even sequencing.
Enforces: current epoch ≥ 2 + last settled epoch, deposit epochs = odd, redeem epochs = even.
Blocks claims from unsettled epochs.
Assertion 4: Silo Balance Consistency
Tracks the immutable Silo contract holding pending deposits and redemptions.
Validates: Silo asset balance ≥ sum of pending deposit requests
Silo share balance ≥ sum of pending redemption requests
Uses event-based verification.
Assertion 5: NAV Validity and Expiration Lifecycle
Validates time-based NAV expiration controlling mode switching.
Enforces: isTotalAssetsValid() returns block.timestamp < totalAssetsExpiration consistently.
Prevents NAV updates during sync deposit windows.
The broad strokes:
Zero downtime
No contract changes
No redeployments
Quick deployment enabled Turtle to deploy their Lagoon v0.5.0 Vaults with institutional-grade security from day one.
Critical difference from pure on-chain DeFi: private credit funds deployed off-chain can't be recovered if stolen.
Prevention isn't optional for RWA protocols, it's the only defence.
All assertions are publicly verifiable.
Users inspect the exact rules protecting funds.
Developers can audit security logic easily in Solidity.
Transparency builds confidence for bringing institutional capital on-chain.
Dual-mode flexibility for DeFi integration. Deterministic security for institutional capital.
Turtle demonstrates how RWA protocols can achieve both without compromise.
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