Optional
The still-retained canonical states (newest epoch first), used to decrypt media from an epoch older than the current tip. Optional — when omitted, decryption uses only the current epoch's key. See GroupMediaService.decryptMedia.
The still-retained canonical states (newest epoch first), used to decrypt media from an epoch older than the current tip. Optional — when omitted, decryption uses only the current epoch's key. See GroupMediaService.decryptMedia.