> For the complete documentation index, see [llms.txt](https://docs.gpu.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gpu.net/gan-chain-l1/gan-consensus-mechanisms/proof-of-authority.md).

# Proof of Authority

Proof of Authority (PoA), represents a pioneering approach to block production efficiency. PoA seamlessly amalgamates the robustness of Proof of Stake (PoS) with the cutting-edge concept of Non-Fungible Token (NFT) Address validation. By harnessing the power of NFT Addresses, this innovative algorithm ensures unparalleled provider validation, thereby fortifying the integrity and security of the GAN Chain network.

**1. Authority Nodes:**

* In a Proof of Authority network, consensus is reached through a set of predefined authority nodes or validators.
* These nodes are typically recognized and trusted members of the network, often representing institutions, organisations, or individuals with a vested interest in maintaining the integrity of the blockchain.

**2. Identity Verification:**

* Unlike Proof of Work (PoW), where nodes compete to solve complex mathematical puzzles or stake tokens, PoA relies on identity verification.
* Authority nodes are required to undergo a rigorous identity verification process, ensuring their legitimacy and credibility within the network.

**3. Block Validation:**

* Authority nodes take turns proposing and validating blocks of transactions.
* Blocks are added to the blockchain based on the consensus of a majority of authority nodes, rather than through a competitive mining process as in PoW.

**4. Transaction Finality:**

* Transactions confirmed by authority nodes are considered final and irreversible, providing a high level of certainty and security for network participants.
* This deterministic approach to transaction finality is advantageous for applications requiring rapid settlement and low latency.


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