{
  "manageEntity": {
    "action": "Save",
    "entityId": "506028",
    "entityType": "Track",
    "nonce": "0xfbfa0e98a5e90aecd63a7c905e68a1f09d5fc804073e5691a6242dfa758c9d37",
    "signature": "0x43e02973ab83d16d4ae5135fa7a39ca4e1a7eb6807e7c9d325aabd1b008605195887042ba0f5fd0a45e6d450531aaa75d59d547c37191fb4dd9bbc07e1e5af891c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}