{
  "manageEntity": {
    "action": "Save",
    "entityId": "391178",
    "entityType": "Track",
    "nonce": "0x621255394f1a88597f7e4a838e4d1f85a8590b74aedba6b541dce07ccd34e681",
    "signature": "0x6fe66201a8696e46c51b757fa4941b06d5a8014e6b048775cc08e93b0acd3f5e58ba44888a4abbd471734ce005ac7ce3e236a4a74677ce28256f735ac29296651b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}