Loading ...That’s a good point, but a MAC address is usually not one of the main ways investigators identify cryptocurrency users.
A MAC address is a hardware identifier for a network device, but:
It typically stays within your local network.
Routers on the internet generally don’t pass your MAC address from one network to another.
A cryptocurrency exchange like Coinbase usually cannot see your computer’s MAC address directly across the internet.
Investigators are much more likely to use:
Exchange records (KYC) — driver’s license, passport, address, bank account.
IP addresses — what internet connection was used.
Blockchain analysis — tracing funds between wallets.
Email accounts and phone numbers used for exchange registration.
Device fingerprints — browser characteristics, cookies, operating system details.
Bank records showing money flowing to and from exchanges.
That said, MAC addresses can become relevant in certain situations:
If police seize a suspect’s computer or phone.
If investigators have access to a local network (home, office, Wi-Fi hotspot).
If malware or forensic software collected the MAC address.
If a user connected to an exchange through a mobile app that gathered device information.
But for tracking Bitcoin transactions across the public internet, MAC addresses are usually much less important than exchange records, IP logs, and the blockchain itself.
The broader point remains: Bitcoin’s weakness as an anonymity tool isn’t usually that someone knows your MAC address—it’s that the blockchain is public forever, and sooner or later many users connect their wallets to a real-world identity through an exchange, bank transfer, or other digital trail. Once that link is made, investigators can often reconstruct years of transaction history.