⚖️ 1. Legal Basis for Blockchain Subpoenas in Germany

German authorities rely on:

🔹 A. StPO (Code of Criminal Procedure)

Key provisions:

• §94 StPO → seizure of evidence (including digital data)
• §95 StPO → production orders (handover of data)
• §100a StPO → telecommunications surveillance
• §100b StPO → online search (device hacking)
• §161 StPO → general investigative powers (important for crypto tracing)

🔹 B. Criminal Code (StGB)

Used when crypto is linked to:

• money laundering (§261 StGB)
• fraud (§263 StGB)
• drug trafficking
• cybercrime

🔹 C. EU Law (very important in crypto subpoenas)

• European Investigation Order (EIO)
• Eurojust cooperation
• Mutual Legal Assistance (MLA)

🔗 2. What “Blockchain Subpoena” Means in Practice

Authorities typically do NOT subpoena the blockchain itself (because it is public).

Instead, subpoenas target:

🏦 Crypto exchanges (most important)

• Binance, Coinbase-type platforms (EU-licensed exchanges)
• Must provide:
  • KYC identity data
  • wallet ownership mapping
  • transaction logs

🧾 Custodial wallet providers

• Hosted wallets = legally identifiable intermediaries

🌐 Internet service providers / device data

• IP logs
• login metadata
• device seizure

🧠 Blockchain analytics companies

• Chain tracing reports used as expert evidence

📊 3. Legal Status of Blockchain Evidence in Germany

German courts treat blockchain data as:

• Documentary evidence (Urkundenbeweis under ZPO §§ 415–418)
• Digital evidence (electronic data records)
• Not automatically “truthful”, but highly probative if verified

⚖️ 4. Key Legal Standards for Subpoena Compliance

For any crypto/blockchain data request, German law requires:

✔️ 1. Legal basis (no fishing expeditions)

• Must be linked to a specific investigation

✔️ 2. Proportionality

• Serious crime threshold (e.g., organized crime, terrorism)

✔️ 3. Judicial oversight

• Courts must authorize invasive measures

✔️ 4. Data minimization (GDPR influence)

• Only necessary crypto data may be requested

📚 5. Important Case Law (at least 6 key decisions)

1. 🧠 BGH – Bitcoin as Seizable Asset

BGH, 1 StR 412/16 (27 July 2017)

Principle:

Bitcoin is a seizable economic asset

Holding:

• BTC qualifies as “thing-like property” for confiscation
• Private keys = control = legal possession

Importance:

➡️ First major ruling confirming crypto is legally attachable

2. 🔗 BGH – EncroChat Evidence Admissible

BGH, 5 StR 457/21 (02 March 2022)

Principle:

Foreign-obtained encrypted chat data can be used in German courts

Holding:

• EncroChat interception evidence is admissible
• No automatic exclusion due to encryption bypass

Importance:

➡️ Sets standard for cross-border encrypted data subpoenas

3. 📡 BVerfG – IT System Fundamental Right

BVerfG, 1 BvR 370/07 (Online Search I, 2008)

Principle:

Creates constitutional right to IT system integrity

Holding:

• Device hacking only allowed for extreme threats
• Strong limits on intrusive digital searches

Importance:

➡️ Limits crypto wallet/device seizure techniques

4. 📞 BVerfG – Data Retention Case

BVerfG, 1 BvR 256/08 (2010)

Principle:

Bulk retention of communication data is unconstitutional

Holding:

• Metadata retention must be strictly limited
• Requires strong safeguards

Importance:

➡️ Restricts mass crypto tracking via telecom metadata

5. 🌍 BVerfG – BND Foreign Surveillance Case

BVerfG, 1 BvR 2835/17 (2020)

Principle:

German constitutional rights apply even to foreigners abroad

Holding:

• Intelligence surveillance must respect fundamental rights
• Strong oversight required

Importance:

➡️ Impacts cross-border blockchain intelligence collection

6. 📱 Anom / Crypto Phone Data Case

BVerfG, 2 BvR 625/25 (2025 refusal to block evidence use)

Principle:

Encrypted phone data from foreign operations can be used in Germany

Holding:

• No constitutional objection to using ANOM/FBI crypto-phone data
• Evidence admissible if lawfully transferred

Importance:

➡️ Confirms lawful foreign crypto surveillance can support subpoenas

7. 🧾 Berlin Regional Court – Crypto Evidence Exclusion Case

LG Berlin, 2021 Crypto Phone Case

Principle:

Illegally obtained encrypted data may be excluded

Holding:

• Evidence inadmissible if:
  • Art. 10 GG violated
  • §100a/§100b StPO not satisfied

Importance:

➡️ Defines limits of blockchain/crypto evidence admissibility

🧩 6. How Blockchain Subpoenas Actually Work in Germany

A typical investigation flow:

Step 1: Wallet identified

• Through blockchain analysis (public ledger tracing)

Step 2: Exchange subpoena issued

• Court order under §94 or §95 StPO

Step 3: KYC match

• Exchange reveals identity behind wallet

Step 4: Device seizure

• Hardware wallet / phone seized

Step 5: Blockchain expert report

• Used in court as technical evidence

🔐 7. Key Legal Reality: Blockchain is NOT anonymous in German law

German courts consistently treat blockchain as:

• Transparent ledger (not private data)
• But identity is only revealed through off-chain data (exchanges, ISPs)

⚠️ 8. Major Legal Tension in Germany

Privacy vs Enforcement conflict:

• Art. 10 GG (telecom secrecy)
• IT-System Grundrecht
• GDPR protections

vs

• need for crypto crime enforcement
• money laundering investigations

📌 9. Conclusion

In Germany:

• There is no special blockchain subpoena law
• Subpoenas rely on StPO investigative powers
• Blockchain itself is treated as public evidence
• The real legal battle is over:
  • exchange data access
  • device hacking legality
  • encrypted communication interception

German courts strongly support:

• strict proportionality
• judicial control
• limits on surveillance
  while still allowing:
• crypto tracing
• exchange subpoenas
• blockchain forensic evidence use in serious crime cases