hash chain

A per-source immutable signal history in cyber. Each signal references the cryptographic hash of its author's previous signal, forming a sequential chain unique to that source.

This structure enables equivocation detection in O(1): if two signals share the same sequence number but differ in content, the fork is immediately provable by any observer.

Hash chains serve as layer 2 of structural sync, working alongside VDF ordering to establish both causal and temporal sequence across the network.

The chain anchors identity to history — a source's full record is tamper-evident and independently verifiable by any node holding the chain tip.

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