{
  "manageEntity": {
    "action": "Save",
    "entityId": "990427865",
    "entityType": "Track",
    "nonce": "0x177c65088f99f801d7d40010e5ee5100884963427d7c7a9713d7892fd6ba3907",
    "signature": "0xba6edb06d635e9c8f92075cf8b3bd635a896ef645e32015b5eb5d05a034687c471f36aca3067dbad4ea7a39aef797e599327d6095ab6f4f699843e8c4568e7701b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}