{"action":"created","comment":{"url":"https://api.github.com/repos/ProtoSchool/protoschool.github.io/pulls/comments/244805781","pull_request_review_id":188767099,"id":244805781,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDI0NDgwNTc4MQ==","diff_hunk":"@@ -0,0 +1,56 @@\n+As we've seen, the centralized web relies on central authorities\n+to host our data and uses URLs as addresses to access it. But location\n+addressing isn't the only option. On the\n+<strong>decentralized web</strong>, we can all host each other's data,\n+and there's a different kind of linking that's more secure, making it easy to\n+trust our neighbors.\n+\n+## Crytographic hashing\n+\n+<strong>[Cryptographic hashing](https://en.wikipedia.org/wiki/Cryptographic_hash_function)</strong> is the\n+most important tool in the toolbox of decentralized data structures. It opens the door to a new form of linking, known as <strong>content\n+addressing</strong>, that we can use in a decentralized environment without central authorities.\n+\n+Hashing takes data of any size and returns you a single fixed-size \"hash\" for that data.\n+A hash is a string of characters that looks like gobbledygook, but you can think of it\n+as a link. It might look something like this:\n+\n+`zdpuAsHkamdCQgrDrNSwJVgjMkQWoLxdrccxV6qe9htipNein`\n+\n+To be honest, these content-derived links aren't currently very friendly to humans\n+(`beagle.jpg` was so much more descriptive!), but they're a lot more secure. Here's why:\n+\n+<strong>Cryptographic hashes can be derived from the content of the data itself</strong>,\n+meaning that anyone using the same\n+algorithm on the same data will arrive at the same hash. If Kyle and Jess\n+are both using the same decentralized web protocol, such as IPFS, to share the exact\n+same photo of a kitten, both images will have exactly the same hash, or link. By comparing\n+those links and confirming they're identical, we can guarantee that every single pixel\n+of those two photos is identical.\n+\n+<strong>Cryptographic hashes are also unique</strong>. That means that if Jess uses Photoshop to remove a\n+single whisker from that kitty, the udpated image will have a new hash, and it will\n+be easy to tell &mdash; just from the link, without access to the file itself &mdash; that it\n+contains different data.\n+\n+## Trust on the decentralized web\n+\n+On the centralized web, we've learned to trust certain authorities and not others. We do our best\n+with the clues we have from URLs, but there are some malicious actors who use the shortcomings of location\n+addressing to trick us.\n+\n+On the decentralized web, where we're all able to pitch in and host each other's data, we may not\n+know much about the <em>peers</em> who are hosting data, but content addressing gives us a way to trust\n+the data that they're sharing. With content addressing, we can't be fooled by malicious actors into\n+accessing the wrong data. That's what makes cryptographic hashing so important to the decentralized web.\n+\n+## Asking peers for content\n+\n+With traditional location addressing, we knew we needed to visit the domain `puppies.com` to find the\n+content stored as `beagle.jpg`. If the `puppies.com` domain were broken for some reason, we'd lose\n+access to that image.\n+\n+The decentralized web works differently. When we want a specific photo of an adorable pet, we ask for it\n+by its content address (hash). Who do we ask? The whole network! If Kyle is online, we'll see that he 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