{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8b993b2556c211b824338ebe1bf6f8580bdf3964ef4fa1bbd6057bc80a6bfb59",
    "signature": "0xf74dea5139494024ac7cb656a9641d191c85a2015eacd9ae6d200f6903ccb9414e2f054f0d6de7416eefdc26db1009ab6cd9e3f2feaa7807a8d2a96ddbbe96201c",
    "signer": "0xDC9FB11483106d427BaC29ff4bf0E03f11b4e19E",
    "userId": "5500"
  }
}