Meridian is a doctoral research project that measures how concentrated public blockchain networks really are. Below you’ll find exactly what our scanner did, what it never does, and how to opt out in one email.
A decentralized network is only as resilient as the infrastructure underneath it. Meridian maps that infrastructure: where nodes run, which providers host them, and which software versions they’re on. From those observations, it measures how concentrated each network is.
Every day, Meridian observes 10 networks—Bitcoin, Litecoin, Bitcoin Cash, Dogecoin, Dash, Zcash, Ethereum, BNB Smart Chain, Gnosis, and Polygon—from four vantage points in the Netherlands, New York, Singapore, and Bucharest.
We publish only aggregate statistics, never individual node addresses. Your node is one of more than 700,000 in the dataset, and it’s never the subject of the research.
We also look up your IP address in public sources: routing data from RIPEstat, location and network from IPinfo, and abuse reports from AbuseIPDB. These lookups never touch your node.
Send the IP address or CIDR range you want excluded to:
abuse@zgos.euWe add it to our blocklist, and port and service checks skip it from the next scan cycle. We also remove it from every published figure. Honoring opt‑outs is a condition of the study’s ethics approval, so there’s nothing else you need to do.