👋🏼 Hello, Product Hunt! I'm Javier, the co-founder of YouCheck and I'm very happy to show you our beta phase after more than a year and a half of hard work. ❓ Have you ever wanted to buy or sell files online and you've been afraid of getting scammed for not receiving the product or the money? 🔒 YouCheck is the best solution thanks to the file previews it creates. Buying and selling files securely and privately is very easy. The seller sets a price, sends a file to the buyer and a virtual space called "room" is created where the file is encrypted and there is the preview of files such as photos, videos, images, audios, contracts, concert tickets, documents, etc... but the preview has low quality, a sepia filter and a watermark to protect it against theft, in addition to not being able to take a screenshot. The buyer will only have to access the "room", see the preview and make sure that the file is the one he really wants to buy and complete the payment so that the file is decrypted and can be downloaded. 💸 You can start buying and selling files for free with our free plan at https://youcheck.so. We are happy to hear your thoughts on our project and improve it for the future. ❤️ We'd love to get your feedback!