![]() However, imagine you are streaming an encrypted file from one provider to another. In some use cases (video, audio, photographs,) if a bit is flipped, it isn't fatal. That said, Backblaze STRONGLY recommends providing the SHA-1 to absolutely guarantee that the file you are uploading matches what gets saved in B2. See SHA-1 Checksums section in the Upload doc. ![]() If they don't match, the file is recreated. If the file is requested for download, the original SHA-1 is matched with the file that's been reassembled from the Backblaze Vault. In addition, the SHA-1 is then saved for the future. ![]() The SHA-1 is required to ensure that the file content uploaded from the client matches the file content persisted on the B2 cloud storage. When you upload a file to B2, you should provide a SHA-1 hash of the contents of the file in the HTTP request header.
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