Bitcoin network
Bitcoin nodes advertise service flags that describe what they can support on the peer-to-peer network. BTCNodes helps organize reachable node data, client signals, network types, and service capability hints where available.
Service flags are capability hints announced by Bitcoin peers. They can indicate whether a node supports network services such as full block serving, witness data, compact filters, or other peer-to-peer features depending on the software and configuration.
Service data helps separate simple reachable peers from nodes that may provide stronger network utility. It can also help show how Bitcoin node capabilities change over time as software versions and defaults evolve.
Service flags are reported by peers and should be treated as observational data. Nodes can change configuration, disconnect during scanning, block crawlers, or expose incomplete details.