Experience Cloud Cookies
Cookie Name: s_ecid
Contains a copy of the Experience Cloud ID (ECID) or MID. The MID is stored in a key-value pair that follows this syntax, s_ecid=MCMID|<ECID>
This cookie is set by the customer's domain after the AMCV cookie is set by the client. The purpose of this cookie is to allow persistent ID tracking in the 1st-party state and is used as a reference ID if the AMCV cookie has expired. Check AMCV cookie here for more details.
CNAME customers only. Not applicable for 3rd-party scenarios. Cookie is stored on your domain, the same domain used by CNAME and your Analytics image request.
Cookie Name: AMCV_###@AdobeOrg
See also, Cookies and the ID Service .
Unique visitor IDs used by Experience Cloud Solutions.
This cookie is used to identify a unique visitor
This cookie is stored at the domain of the website (not the domain of the image request).
Varies, most customers can expect this cookie to be around 200 bytes in length.