Blockchain technology offers timestamps for media files, providing assurances of ownership, integrity, and existence on mobile devices. BlockNotary Timestamp serves to notarize various media files, producing a publicly verifiable receipt that confirms their origin, timestamp, authenticity, and integrity while keeping the content private. This tool is beneficial for digital attribution, establishing proof of existence, possessing prior knowledge, maintaining integrity, and confirming authenticity. By utilizing OpenTimestamps (OTS), the InterPlanetary File System (IPFS), and public blockchains like Bitcoin or Ethereum, it generates entirely distributed proofs. The receipts created are not only independently verifiable but also machine-readable, ensuring their reliability. To utilize this service, simply upload your media file through the app, which will securely store it within a distributed file system safeguarded by blockchain technology, enhancing both security and accessibility. This innovation empowers users to maintain a trustworthy record of their digital assets.