{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0f544bfa4711a0cabbce78d7c33285ca9ac26c288cadc1f189c746f81c62b2cc",
    "signature": "0xd0dfa29a24cc01886cce53a11d130b06bdd22be02ad15d5b7866b407dd702cfb20b92c44ca782b75c7d5c64c3aa2bf9800ad6f0546f011c0737a288184a1317f1b",
    "signer": "0xc3FA9e1bAe2e9cD7A87f8f3D108C015990f5dE4A",
    "userId": "998418410"
  }
}