{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0b8a1b0fd1b09c69f49fca40965a18ead64bd25dc9cadd018d1541c607920144",
    "signature": "0xa28dc80d6d2e23697df379806fd960d6f54c9a7817c895b4bb10a1b4a244317a5cae487072ec9fbaea9a3d3fc661022734d266d7b010d04c472ffc039aae265c1c",
    "signer": "0x343FF28Ab8C942919E3753f03D78361CA20CA77e",
    "userId": "519346245"
  }
}