1. What is DeFi-Bank Interaction?

3 Models:

Model 1: Banks as On/Off Ramp (India Pre-2020)
Banks provide accounts to crypto exchanges, which provide access to DeFi. RBI tried to ban this.

Model 2: Banks as Clients of DeFi (2024-26)
Banks deposit stablecoins into DeFi lending pools for yield. BIS warns: Crypto exchanges are morphing into shadow banks by offering savings, lending, yield products that mimic traditional banking while operating outside framework that prevents bank runs. Stablecoin lending on Aave, Compound, Morpho - institutions borrow yen via OTC, convert to USDC, deposit into DeFi to earn 4-6%.

Model 3: Banks Building DeFi (Permissioned DeFi)
JPM Onyx, DBS, SBI - using DeFi rails (Compound fork) but with KYC. Called Institutional DeFi.

Risk per BIS:

• Oracle manipulation risks in DeFi may be worse than data reporting risks in TradFi, because anonymity increases incentives for malicious behavior
• DeFi services may facilitate money laundering, financing of terrorism and tax evasion. As they operate outside regulatory frameworks, not mandated to comply with AML laws
• Systemic Risk: BIS developed G-SIP framework - Global Systematically Important Protocol - scoring Aave, Compound, Liquity, MakerDAO which account for 88% of blockchain banks on Ethereum. Score captures systemic risk beyond LTV.

2. Regulatory Position - Banks Cannot Freely Interact

Why banks hesitate: Lack of clarity on regulatory treatment of DeFi protocols makes it difficult for regulated institutions to work with DeFi providers. Venturing into DeFi poses greater regulatory challenges - uncertainty exposes banks to compliance risks including liability, money laundering and tax-related concerns.

UAE 2025 Law: Federal Decree Law No. 6 expands UAE central bank's authority over DeFi, ending "just code" defense and imposing penalties up to $272M. DeFi protocols now need license if serve UAE users.

India: No ban, but not regulated. Banks can provide accounts to crypto businesses after SC judgment, but DeFi interaction still requires compliance with PMLA, FEMA.

3. Case Laws - DeFi x Banks

Case 1: Internet and Mobile Association of India vs RBI (2020) 10 SCC 274 - SC Lifts Banking Ban - India Foundation Case
RBI circular April 6, 2018 prohibited banks and other RBI-regulated entities from facilitating virtual currency transactions. IAMAI challenged.
Supreme Court bench Justices Rohinton Nariman, S Ravindra Bhat, V Ramasubramanian held on March 4, 2020: SC lifts ban imposed by RBI. Court ruled RBI's circular violated freedom of trade under Art 19(1)(g) and failed proportionality test. Held: Without appropriate legislative support, regulatory actions cannot be complete ban and must be commensurate with risk assessed. RBI had not presented sufficient empirical evidence demonstrating that crypto activities caused harm to regulated entities. Doctrine of proportionality adopted - entire prohibition of banking access disproportionate.
Impact: Banks can now provide services to crypto exchanges, which are gateway to DeFi. Foundation for all bank-DeFi interaction in India.

Case 2: Tornado Cash - US - Van Loon vs Treasury (2023) + Roman Storm Conviction (Aug 2025)
OFAC sanctioned Tornado Cash, decentralized mixer, for facilitating money laundering. Federal court in Texas upheld sanctions in Van Loon v Treasury.
Dutch judge in Court of 's-Hertogenbosch sentenced Alexey Pertsev, founder, to 64 months for money laundering.
US: Co-founder Roman Storm convicted Aug 2025 for operating unlicensed money transmitting business under 18 U.S.C. § 1960. Verdict sent chill through DeFi developer community. DOJ strategy: focusing on criminal intent and individual harm rather than broad regulatory overreach. DOJ proved you can lose war against protocol, but win war against developers.
Banking implication: If bank interacts with Tornado Cash-tainted funds, it violates OFAC sanctions - strict liability. Banks must screen DeFi withdrawals.

Case 3: Samourai Wallet - DOJ vs Founders (April 2024, Guilty July 2025)
DOJ filed lawsuit against two founders for unlicensed money transmission via crypto mixer. July 2025, pleaded guilty in SDNY, facing up to 5 years. Same principle - DeFi developers liable as money transmitters if they operate/maintain control.

Case 4: SEC vs DeFi - CLARITY Act + Broker Rule (2025)
SEC's Peirce defends transaction privacy, opposes DeFi broker rule which would have required extensive transaction record-keeping. Lummis CLARITY Act shields DeFi from SEC overreach after Tornado Cash case. Framework: No offshore shell companies, no need to overly worry about decentralization degree if no custody. Banks that run DeFi front-ends may be broker-dealers.

Case 5: BIS - DeFi Lending TVL & Liquidation Cascades
BIS recorded DeFi lending TVL peaked at $50B in early 2022. 2025 incident: KelpDAO drained ∼$292M, forcing Aave to suspend operations to prevent liquidity crises. BIS warning: AI-driven selloffs could infect DeFi credit markets - algorithmic traders accelerate routine selloff into systemic credit freeze, describes exactly what happens when bot triggers cascade of liquidations on Compound or Aave.

4. Compliance Framework for Bank Interacting with DeFi

If you are a Bank/ NBFC wanting to interact:

1. PMLA: DeFi transaction = cross-border? Apply Travel Rule - need originator/beneficiary info. Anonymous DeFi fails.
2. FEMA: Crypto is not legal tender, but if you invest bank's own funds in DeFi yield, need RBI approval under Overseas Investment rules.
3. Sanctions Screening: Screen smart contract addresses against OFAC list (Tornado Cash addresses sanctioned)
4. Prudential: RBI requires 150% risk weight for crypto exposure (proposed). Cannot count DeFi yield as stable NII.
5. Consumer Protection: If bank offers DeFi yield product like Coinbase offering 3.5% on USDC vs traditional savings 0.38%, regulators treat as deposit-like - requires deposit insurance disclosure.

Current Safe Model for Banks (JPM, SBI):
Use Permissioned DeFi Pool - fork of Aave but whitelist KYCed institutions via Soulbound Tokens. No anonymous interaction. Keeps DeFi efficiency, meets AML.