{"type":"rich","version":"1.0","provider_name":"Transistor","provider_url":"https://transistor.fm","author_name":"Programming Tech Brief By HackerNoon","title":"DocProof Lets You Prove a File Existed—Without Uploading the File","html":"<iframe width=\"100%\" height=\"180\" frameborder=\"no\" scrolling=\"no\" seamless src=\"https://share.transistor.fm/e/e08b3512\"></iframe>","width":"100%","height":180,"duration":281,"description":"\n        This story was originally published on HackerNoon at: https://hackernoon.com/docproof-lets-you-prove-a-file-existedwithout-uploading-the-file.\n             There's a problem that\ns been bugging me for a while. How do you prove a document existed at a specific point in time—without handing it over to someone \n            Check more stories related to programming at: https://hackernoon.com/c/programming.\n            You can also check exclusive content about #software-engineering, #web3, #document-timestamping, #proof-of-existence, #proof-of-prior-art, #cryptographic-timestamp, #sha-256-hash, #client-side-hashing,  and more.\n            \n            \n            This story was written by: @znow. Learn more about this writer by checking @znow's about page,\n            and for more stories, please visit hackernoon.com.\n            \n                \n                \n                Document verification can be difficult or impossible without trusting a third party with your files. Daniel G. has developed a way to prove a document existed at a specific point in time. The proof is created on the blockchain using a cryptographic fingerprint. The document itself never leaves your device and the hash reveals nothing about the content.\n        \n        ","thumbnail_url":"https://img.transistorcdn.com/KhCapPSRkLGL2Xw8888yuChkNRWthaKapLYTvNdu4W4/rs:fill:0:0:1/w:400/h:400/q:60/mb:500000/aHR0cHM6Ly9pbWct/dXBsb2FkLXByb2R1/Y3Rpb24udHJhbnNp/c3Rvci5mbS9zaG93/LzQxMTY2LzE2ODM1/ODIzMzAtYXJ0d29y/ay5qcGc.webp","thumbnail_width":300,"thumbnail_height":300}