Definition ∞ Proof of Work sidechains are secondary blockchains that use a mining process to secure their network. These sidechains operate independently from a main blockchain but allow for two-way transfers of assets. Their security relies on computational work, similar to Bitcoin’s main chain, where miners compete to add new blocks. This consensus mechanism helps maintain the integrity and resistance to attack for the sidechain’s transaction history.
Context ∞ Proof of Work sidechains present an alternative scaling solution to other consensus mechanisms, offering a familiar security model to many digital asset participants. A key discussion point involves the energy consumption associated with Proof of Work and its environmental implications, alongside the challenges of maintaining sufficient decentralization. Developments often focus on optimizing mining efficiency and interoperability with main chains.
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