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Alonso Sala
CRIMINAL LAWYERS
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Legal Analysis

MiCA II and Total Traceability: The End of Crypto Secrecy

calendar_todayDecember 14, 2025

Last updated:

lightbulbKey Takeaways

  • check_circleTFR Regulation (Travel Rule)
  • check_circleUnhosted Wallets under surveillance
  • check_circleLaundering by Mixers usage
  • check_circleCrypto Regularization

Quick answer

The Transfer of Funds Regulation (the European 'Travel Rule') requires crypto-asset service providers to identify both originator and beneficiary, and to identify the holder of an unhosted wallet or block the transaction where it exceeds 1,000 euros. This places documentary traceability at the disposal of the prosecution: if the amount defrauded from the Tax Authority exceeds 120,000 euros, the failure to declare stops being an administrative infringement and becomes a tax offence under Art. 305 CP. Using mixers or privacy coins is treated as evidence of laundering, requiring the investor to prove the lawful origin of the funds.

Need help with your case? Talk to a criminal defense lawyer at Alonso Sala.

The year 2025 marks the definitive end of anonymity in the European crypto ecosystem. The full entry into force of the Transfer of Funds Regulation (TFR), often called the European "Travel Rule", requires all Crypto-Asset Service Providers (CASPs) to collect and share personal data of originators and beneficiaries in all transactions, without a minimum threshold. These same providers must also hold a licence to operate in Spain, as we explain in our guide on the MiCA licence for exchanges. This has devastating consequences for those who maintained hidden assets in crypto.

The 'Travel Rule' and Money Laundering

If you send cryptocurrencies from a regulated Exchange (such as Binance or Coinbase) to an unhosted wallet (Metamask, Ledger), the Exchange is obliged to identify the holder of that private wallet if the operation exceeds 1,000 euros, or to block the transaction. For criminal defense, this means that documentary traceability is served on a platter to the Prosecution. The argument of "I lost the keys" or "I don't know who owns it" becomes unsustainable.

Implications in Tax Crime

The Treasury now receives automatic information flows. Non-declaration of these holdings is not a simple administrative infraction; if the defrauded quota exceeds 120,000 euros, it is a tax crime. And beware: concealment through the use of undeclared cold wallets is considered an indication of aggravated intent and obscuration, which makes applying mitigating factors difficult.

The Use of Mixers as Criminal Indication

Under the new regulatory lens, the use of mixing tools (Mixers) or privacy coins (like Monero) is considered by SEPBLAC and the courts as a "laundering technique" per se, de facto reversing the burden of proof. The investor must prove the lawful origin of the funds with extreme evidentiary force (forensic reverse traceability reports) to avoid fund blocking and criminal indictment.

Defense of Early Adopter Investors

Our firm specializes in reconstructing the financial history of investors who entered Bitcoin a decade ago, when KYC records did not exist. We use blockchain archaeology to prove that the assets, although opaque, have a lawful and non-criminal origin, dismantling the laundering accusation.

Need a criminal defence lawyer?

If you are facing a criminal matter, our team of specialist defence lawyers can help. Contact us for a case assessment.

Frequently asked questions

What is the 'Travel Rule' under the TFR Regulation?expand_more

It is the transfer-of-funds rule that requires crypto-asset service providers (CASPs) to collect and share the originator's and beneficiary's data on every crypto-asset transfer. For transactions to or from an unhosted wallet above 1,000 euros, the provider must identify the wallet holder or block the transaction.

Can holding undeclared cryptocurrency be a crime?expand_more

Yes. If the amount defrauded from the Tax Authority exceeds 120,000 euros, the failure to declare stops being a mere administrative infringement and becomes a tax offence under Article 305 of the Criminal Code. Concealment through undeclared cold wallets can be treated as evidence of intent and make mitigating factors harder to apply.

Is using mixers or privacy coins like Monero illegal?expand_more

Using mixers or privacy coins is not in itself a crime, but SEPBLAC and the courts treat it as a laundering technique that requires the investor to prove the lawful origin of the funds with particular rigour to avoid asset freezing and prosecution.

Does the new traceability affect long-term investors without KYC?expand_more

Yes. Investors who acquired crypto-assets years ago, when KYC records did not exist, must be able to document the lawful origin of their wealth. Blockchain traceability makes it possible to reconstruct that history, which is key to dismantling a money-laundering accusation.

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