{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x661c2d319da1db58c1b01917d9cbe32cb28a27da542aca9a996bb5dfcb15927b",
    "signature": "0xd12c36e52c81e6e7bdb78f1de75598093cd6ae188a2939c7c32400fc88fcf70a11c867f70d2b406caa2181aca286710601d36f14f9dc989921428255f1328c921b",
    "signer": "0x63EbE5a1B5C5F156330BDf810f5fFf6A224c75c8",
    "userId": "309080"
  }
}