{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x055f3f43633309c02373eb1c4bc2c2cb3f9f03cc7b61c14e88c4b02ae4844bca",
    "signature": "0x6333e93e81b504a126cef5dc5d4006cee383168779f9ff849a882d90661f13a723a833d3d470b09ffbc3c5e5589fb0a44f30f2bfe502cd3aa38ca18c6197cc111c",
    "signer": "0x54DF377599a1C40291C2c518c727C716D504e667",
    "userId": "591810501"
  }
}