PoW anchoring, or Proof-of-Work anchoring, is a security technique where a less secure or newer blockchain periodically records a hash of its state onto a more established, secure Proof-of-Work blockchain. This process leverages the computational security of the stronger chain to protect the history and integrity of the anchored chain. It provides an additional layer of security against certain types of attacks.
Context
PoW anchoring is a relevant topic in discussions about blockchain interoperability, layer-two scaling solutions, and the security of sidechains or smaller chains. News may report on protocols implementing PoW anchoring to enhance their security guarantees, particularly when the anchored chain itself might not possess sufficient native hash power. This technique is a practical application of leveraging existing robust security for newer or more specialized blockchain systems.
A new protocol anchors Proof-of-Stake history to Bitcoin's Proof-of-Work, providing an external trust source to cryptoeconomically secure PoS against long-range attacks.
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