Cryptocurrency as Personal Data
A Bitcoin wallet address is a string of 26–35 alphanumeric characters in Base58Check encoding, beginning with "1", "3", or "bc1". An Ethereum address is "0x" followed by 40 hexadecimal characters. These addresses are pseudonymous — they do not directly identify individuals — but under GDPR, pseudonymous data that can be linked to an individual through additional processing is personal data.
A cryptocurrency exchange that holds KYC data (linking wallet addresses to verified bezeroa identities) holds personal data within GDPR's scope: the wallet address, in combination with the KYC erregistroa, identifies a natural person. The wallet address alone is personal data within the exchange's data environment, because the exchange can link IT to an individual.
EU MiCA (Markets in Crypto-Assets) regulation, effective from December 2024, adds a finantzaria erregetaleak layer: cryptocurrency asset zerbitzua providers (CASPs) must implement appropriate controls for bezeroa datuen babesa. The intersection of MiCA and GDPR means that a European crypto exchange faces both finantzaria regulation (MiCA's datuen babesa requirements for CASPs) and general datuen babesa law (GDPR) for the same wallet address data.
The detekzioa Gap
estandarra PII detekzioa tools were designed for traditional finantzaria identifiers: IBAN, account number, routing number, SWIFT/BIC. These tools have no kontzientzia of cryptocurrency address formats. A dokumentua containing a Bitcoin wallet address, an Ethereum address, and a SWIFT code will have the SWIFT code detected and the two cryptocurrency addresses missed by any tool that does not include crypto address entity types.
For a European crypto exchange processing KYC dokumentuak: bezeroa bank account IBANs are detected by estandarra tools. The bezeroa's Bitcoin wallet address used for initial funding is not detected. The SWIFT code for the wire transfer from their bank is detected. The Ethereum address used for token purchases is not detected.
The missing detekzioa is not a minor gap — wallet addresses are core finantzaria identifiers in crypto contexts, as sensitive as account numbers in traditional banking contexts.
GDPR Article 32(1)(a) requires pseudonymization and zifraketa as oinarri technical measures. 56% of GDPR fines cite inadequate zifraketa as a contributing factor. An organization that encrypts all detected PII but fails to detect cryptocurrency wallet addresses has encrypted nothing relevant to its core business operations.
Sources: