{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xdf18f6fdea24e578cc7f4a7a309a15bb670e63d23f9da8e818d863dda2758977",
    "signature": "0x9c1596b63e758a9127d478c8f019d063b343797a697d4bf16e7d4b6b4b059202345ef3d40e8d7b793892b1c275c2f4ab0deb01431bf17921dd1983f126e307121c",
    "signer": "0x9f6407dF7D0ABb10c5542e6a490e184bFaB2e065",
    "userId": "315508809"
  }
}