Directory that holds metadata of the Circle of Trust (CoT) partners. If Auto CoT is enabled, this directory needs to be writable at run time.
Typical metadata file path would be
/var/zxid/cot/Inkl5fOnhVNa0LbWjHem2Y2UphY
If the metadata file appears in this directory, then the entity is in the CoT.
The file name component of the path is safe base64 encoded SHA1 hash of the Entity ID, with last character stripped (that character would always be an equals sign).