{
  "manageEntity": {
    "action": "Save",
    "entityId": "1418270820",
    "entityType": "Track",
    "nonce": "0x10515175dc0f44073f154e37a103317f204a5cfaa463191c1113b5243ff1eb7f",
    "signature": "0x4a751a22dde6974ccbec6cc5a47028605d0283fdf7cd068ccf91f016478711ed5e2c2ea46c19f6a5baf22e11f7943e8130b8b4e9c15c882c09c7f51c4f7d288f1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}