![]() When you track the anonymousId, you can attribute activities over multiple days to the same user by collecting all of the activities with that ID. You can use the anonymousId to link events performed by the user as they navigate around your website. That anonymousId is saved in the user’s cookie, as well as localStorage, and will stick with that user until the cache is cleared or a reset call is triggered. If you’re using Segment’s browser or mobile libraries, the Segment SDK generates and sets a UUID as anonymousID at the user’s first visit to your site. Whenever possible, follow the identify call with a track event that records what caused the user to be identified. ![]() ![]() If the user clears their cookies and localStorage, all of the IDs are removed and the user gets a completely new anonymousId when they next visit the page. If a user returns to your site after the cookie expires, Analytics.js looks for an old ID in the user’s localStorage, and if one is found, sets it as the user’s ID again in a new cookie. ![]() This makes it possible to append the user’s data to all subsequent page calls or track calls for the user, so you can properly attribute those actions. If you’re using one of the Segment mobile libraries, the userId and traits are stored in the device’s memory. When you make an identify call using Segment’s Analytics.js library, Segment saves the userId to the browser cookie, and writes all the user traits in localStorage. In this instance, you would record that email address as a trait, and for the identifier (ID), you would use anonymous ID. An example of this might be, a user that visits your site and doesn’t register, but they do give you their email address through a newsletter email sign-up form. There are instances where you want to record information about a user that isn’t already known to you. The identify call specifies a customer identity that you can reference across the customer’s lifetime. Tracking users with the identify and track calls reduces the number of Monthly Tracked Users you are billed for. When you use these calls together, you can attribute actions on your site or app to individuals, and gain a better understanding of their activities, identity, and use patterns over time. It works across all the platforms both browser and server environments.The most important calls you make with Segment are the identify and track calls. You can easily generate UUIDs in JavaScript using the library called uuid. So it's not recommended to use version 5 UUIDs anymore. However, according to the fast-paced technology these days, SHA-1 is facing the same security issue as MD5. Therefore, version 5 UUIDs replaced MD5 with SHA-1 which is a better hashing algorithm. Nowadays the MD5 hashing algorithm is considered vulnerable and easier to crack. Version 5 - Version 5 UUIDs are similar to version 3 with stronger encryption. However, the possibility of duplication for version 4 UUIDs is extremely low practically. There is no guarantee that version 4 UUIDs will be unique when generated. Version 4 - Version 4 UUIDs are completely randomized. Version 3 - Version 3 makes use of the MD5 hashing algorithm to generate a UUID. Therefore, most UUID libraries skip implementing version 2 which result in version 2 UUIDs not being used practically. This version is reserved by RFC 4122, and no further details are announced. Version 2 - Version 2 UUIDs are similar to version 1 with DCE security. Version 1 UUIDs are mostly used in transactions to ensure uniqueness. However, the pro is version 1 UUIDs generated on the same machine will always be unique according to the different timestamps. The main con of version 1 UUIDs is that the MAC address of the machine used to generate them is exposed which could lead to security issues. Version 1 - Version 1 UUIDs are generated from the combination of the MAC address of a machine and the current timestamp in nanoseconds.
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