A node layer refers to the structure and organization of nodes within a blockchain network. Nodes are individual computers or devices that participate in the blockchain by maintaining a copy of the blockchain ledger and validating transactions.Each node plays a specific role based on its function. For instance, some nodes may focus on validating transactions, while others may serve to store copies of the blockchain or relay information to other nodes. This distributed architecture ensures that the network remains decentralized and resilient against failures or attacks.The node layer is crucial for the overall security and efficiency of a blockchain. It helps in achieving consensus, meaning all nodes agree on the state of the blockchain, which prevents issues like double-spending. Different blockchain networks may have varying types of nodes, such as full nodes, light nodes, and mining nodes, each contributing differently to the network’s operations. Overall, the node layer is fundamental to maintaining the integrity, security, and functionality of the blockchain ecosystem.