{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x53243dda051200f1c2f49886a8e9bc9499e9add17e0cb391c32e6c90ee19c01c",
    "signature": "0x4e27861cf6a9c8d9d64b176c8b68c9929556fb1dadc245cade68fca77b6d5fb83f393862366834206b1c1ef26107baaf1460aa591a91caaa3ebd154b847688471c",
    "signer": "0x0748A94f1CD97A564813dD883A13A2faccCfa757",
    "userId": "309295492"
  }
}