{
  "manageEntity": {
    "action": "Save",
    "entityId": "1972664849",
    "entityType": "Track",
    "nonce": "0xa87dd6c75a75a5c02ee95f3ab905733b1064ecaf72a8a5c3a64db4b8d4b0b762",
    "signature": "0x238100ed3b5193ae9dc08ba52e431933cf23a38e19fece499f6a482816e99aeb343530bc51c3b06f3703de963854ce7e0e72f734be9bc40d7d2bd05f729ecf8e1c",
    "signer": "0x6fd4b926331853489304b9973F5e002029907f35",
    "userId": "954228"
  }
}