In the context of spam transactions, “Sybiled” refers to the use of a Sybil attack—a tactic in which a single adversary creates multiple accounts, nodes, or identities to manipulate or overwhelm a network. When a network is “Sybiled,” it is being flooded with fraudulent or artificially generated transactions from many controlled sources, with the intention of spamming the network, degrading its performance, or manipulating protocols that assume one-entity-one-identity.

This is particularly relevant in blockchains and decentralized systems, where open participation without strict identity verification can make it easier for bad actors to launch Sybil attacks. Spam transactions from Sybil identities can clog the network, increase transaction fees, and reduce usability for legitimate users. Networks often deploy defenses such as proof-of-stake, proof-of-work, or transaction fees to deter or mitigate Sybil-based spam.