Coin Counsel Crypto Brief: A $6 Million Whitelist Slip on Base, Polymarket Sues the Dutch Regulator, and Japan Freezes Garantex

Four developments over the past two days turn less on broken code than on who signed what and which list a name sits on. Below: a $6 million loss on Base, a Dutch court fight over whether prediction markets are gambling, a Japanese asset freeze, and the first state salaries in digital rubles.

A $6 Million Loss on Base Came Through the Whitelist

On October 4, an attacker drained about 1,783 wstETH, roughly $6 million, from a Base vault that routed deposits through Aave V3. The lending protocol was not broken. A freshly deployed attacker contract was added to the vault's permission list, used to borrow interest-bearing deposits, then used to redeem them for ether derivatives. On-chain records tracked by Blockaid and PeckShield show the vault's Safe multisig removing that contract from the whitelist at 08:52 UTC and re-adding it a minute later, with valid signatures from existing signers.

That signature detail is what makes the loss hard to litigate. Where an exploit turns on a coding flaw, a claimant points to unauthorized access; here the transactions carry valid authorization from the people holding the keys, pushing any claim toward breach of duty or a key-compromise theory that has to be proven. And no protocol had publicly claimed the vault. A loss with no identifiable operator is a loss with no one to sue.

Polymarket Takes the Dutch Regulator to Court

On October 5, Polymarket said it will challenge the Netherlands Gambling Authority (the Ksa) in administrative court over its finding that the platform's event contracts are unlicensed games of chance. The Ksa issued its order against Adventure One QSS Inc. on January 20, rejected Polymarket's objection on June 23, and set penalties at €420,000 a week, capped at €840,000. The order stays in force during the appeal, so the Dutch block stays up however the case resolves. The dispute is about characterization: the same contract can be a regulated derivative in one country and prohibited gambling in the next.

Japan Adds Garantex to Its Asset Freeze List

Reporting on October 4 confirmed Japan designated the Moscow exchange Garantex, effective October 2, alongside 32 other entities, nine individuals and 35 shadow-fleet vessels. Garantex has processed roughly $96 billion since its April 2019 founding. Japan is aligning with existing U.S. and EU designations rather than alleging anything new, which is the compliance lesson: screening is jurisdiction-specific, and a counterparty blocked in Washington and Brussels may have remained transactable in Tokyo until now. The order also names Grinex as a successor platform, so name-only screening misses the restructured version of the same operation.

Russia Begins Paying Salaries in Digital Rubles

Also on October 4, Russia's Finance Ministry confirmed its first salary payments in digital rubles, part of a rollout begun October 1. Participation is voluntary, but the timetable is statutory: universal-license banks and larger merchants must join by September 1, 2027, basic-license banks a year later. A state-run ledger is standing up outside the correspondent banking system sanctions enforcement relies on, and the EU's April 2026 ban on supporting digital ruble development already reaches firms giving technical help, not only those moving funds.

What This Means for You

If you hold assets in a DeFi vault, the Base incident calls for a concrete audit. Find out who controls the allowlist, how many signatures are needed to change it, and whether changes are timelocked or announced in advance. A permission list editable in one block by a small signer set is a single point of failure however well the protocol is audited.

If you have already lost funds, preserve the evidence now: transaction hashes, block timestamps, signer addresses, and any multisig records showing who authorized a permission change. In a signed-transaction exploit that trail is the case, and it gets harder to reconstruct each week. On the compliance side, re-screen counterparties against Japanese designations as well as U.S. and EU lists, and document the review — regulators increasingly treat a missing process as the violation itself.

At Coin Counsel, we work with individuals and businesses navigating the legal fallout of crypto fraud — whether you're a victim seeking recovery, a company facing regulatory scrutiny, or a project working to stay compliant in an increasingly complex legal landscape. The rules are evolving fast, and the cost of getting it wrong has never been higher. Contact us at coin-counsel.com to speak with a crypto-focused attorney today.

Disclaimer

This blog post is for informational purposes only and does not constitute legal advice. Reading this content does not create an attorney-client relationship between you and Coin Counsel or Franco Law PLLC. The legal landscape surrounding cryptocurrency is rapidly evolving and varies by jurisdiction. Do not act or refrain from acting based on information in this post without first consulting a qualified attorney. If you believe you have been the victim of crypto fraud, contact us at coin-counsel.com for a consultation.