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(Signature Hash Blob) is a unique digital signature generated by Apple. Think of it as a "digital ticket" that Apple issues to authorize the installation of a specific iOS version on your specific device.

: To save your blobs, you typically need your device's ECID (a unique ID). You can find this using tools like iTunes , 3uTools , or the System Info tweak for jailbroken devices.

In essence, an is the middleman that either:

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