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name: bitcoin-l2-merlin description: | Merlin Chain: Polygon-CDK Bitcoin L2 with EVM and a federation peg; its Bitcoin fraud-proof module is still unshipped as of September 2026. Was the TVL leader in 2024; DeFi TVL is down ~98% from that peak as of September 2026. USE WHEN: evaluating Merlin for deployment, BTC DeFi. allowed-tools: Read, Grep, Glob

Merlin Chain

Bitcoin L2 with EVM compatibility. Held the largest TVL among Bitcoin L2s during 2024; that is no longer true. Two metrics, both DefiLlama, both 15 September 2026:

Metric	Value	Peak
Merlin chain DeFi TVL	~$9.3M	~$529M (5 May 2024)
Merlin's Seal bridge vault (BTC locked)	~$410M	~$2.65B (29 Mar 2024)

On the same date Stacks ($79.3M) and Rootstock ($79.0M) each hold roughly 8x Merlin's chain DeFi TVL, and BOB (~$10.2M) is ahead of it too. Bridge-locked BTC and value actually deployed in Merlin DeFi are not the same number and have diverged by ~40x. DefiLlama tracked 27 protocols on Merlin on that date, 9 of them holding more than $10k. Re-check before quoting: https://defillama.com/chain/Merlin for chain DeFi TVL, https://defillama.com/protocol/merlins-seal for the vault.

Architecture

• ZK rollup posting state commitments to Bitcoin.
• EVM execution.
• Federation peg for BTC bridging.
• Native token: MERL.

Ecosystem

• DeFi: lending, AMMs, stable coins.
• Inscriptions / Ordinals integrations.
• Cross-chain bridges to Ethereum L2s.

Position

Was the "leading TVL" Bitcoin L2 through 2024, on TVL that was partly inflated by yield-farming incentives; when the incentives tapered the TVL left with them. Chain DeFi TVL slid from ~$169M (1 Jan 2025) to ~$9.3M (15 September 2026). The contraction is sector-wide, not Merlin-specific: over the same window Bitlayer went ~$361M -> ~$0.46M and BSquared ~$89M -> ~$2.6M (DefiLlama, same dates). Mainnet is still live and producing blocks — ~4.05s average block time, ~850 transactions logged by 18:49 UTC on 15 September 2026 per the Blockscout explorer — but at a fraction of its 2024 activity. The project continues to ship: merlinchain.io was advertising a 45% APR MERL staking program on 15 September 2026. Critique: heavy reliance on federation for now, slower path to trust-minimization.

Use cases

• BTC yield products.
• EVM dApps with Bitcoin-themed user base.
• Cross-chain liquidity hubs.

Limitations

• Federation trust — still the dominant risk: the Merlin's Seal vault held ~$410M of BTC on 15 September 2026, orders of magnitude more than the chain's own DeFi TVL, and the Bitcoin fraud-proof module has not replaced it.
• TVL was inflated by mercenary yield-farming users, and the 2025-2026 drawdown is what that unwinding looks like. Treat any TVL or dApp-count figure in this skill as a dated snapshot, not a fact.
• Thin on-chain liquidity — 9 protocols above $10k TVL on 15 September 2026 (DefiLlama). Expect slippage and shallow markets.
• Centralization concerns common to early L2s.

See also

• bitlayer/SKILL.md
• bsquared/SKILL.md
• hemi/SKILL.md
• bob/SKILL.md