# Advantages Compared to other solutions to generate proofs of timestamps (both off-chain and on-chain), you can find in tProof the following main advantages: * **Decentralized**: anyone can interact with our smart contracts * **Single upfront payment**: you pay once to generate the certification, and it will last forever * **Clear Ownership**: certifications are owned by you, stored inside your wallet * **NFT-based**: implementing ERC-721 standards, each proof is managed through an NFT, containing metadata to better identify the proof, while making easier it's transfer or trade * **Multi-chain**: works on different chains, while keeping a unique ID across them * **Flexible**: files can be kept private, with just the hash being published, or made public via a Chainlink Oracle system --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.tproof.io/advantages.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.