Common types of on-chain data graphs include:

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At its most fundamental level, the Bitcoin blockchain is a directed acyclic graph (DAG).

Nodes (Vertices): Each block is a node.
Edges (Connections): A directed edge (arrow) points from a block to the next block, formed by each block header containing the hash of the previous block's header. This creates an unbroken, chronological "chain" of blocks.
Immutability: This graph structure makes the blockchain highly secure. To change a past block, you would need to re-compute its hash, and then the hash of every subsequent block in the chain, requiring immense computational power.
Within each block, transactions also form a conceptual DAG:

Nodes: Unspent Transaction Outputs albania phone number list (UTXOs) are the "nodes" of spendable Bitcoin.
Edges: Transactions are the "edges" that consume old UTXOs (inputs) and create new UTXOs (outputs). This shows the flow of value.
Graphs of On-Chain Data (Blockchain Metrics):
This is perhaps the most common interpretation of "Bitcoin blockchain graph." These are data visualizations that plot various metrics derived directly from the Bitcoin blockchain over time. They are crucial for understanding network health, adoption, security, and underlying economic activity.