{
  "manageEntity": {
    "action": "Save",
    "entityId": "701948",
    "entityType": "Track",
    "nonce": "0x2133d1ecb618cfe52faeb7949fe5920e01c73a4b56e57788fc05ea083a11ddb7",
    "signature": "0x0e09c66bcf4f5a3ededb7d96351767f828643ce3deded4708a738ea6231eb1b73186ae99ffa354d5234e70f5d2ba1596d8d03aa933bd08df12af6388426cf4d91c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}