{
  "manageEntity": {
    "action": "Save",
    "entityId": "637909",
    "entityType": "Track",
    "nonce": "0x87dcb6ab81a278c8b3e8c1eead0523191010ee04a53d542a951d77e911ecdae1",
    "signature": "0x9d26b4fe3d8456d31246b768c92ee432d160165b4d093435f4f9d84a9889e6c31d4d7a8ca0d4f5d728b88d01f058ef2fbf2fb6faabc8321a4a3a52dd993fdff51b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}