{
  "manageEntity": {
    "action": "Save",
    "entityId": "1504137330",
    "entityType": "Track",
    "nonce": "0x3f2937d0a5b13a65165763fb25ae2916a0b30653b1ababbc79124913de71230c",
    "signature": "0xbac9694df0beef09aef3c3fd45030d6a509917e5861c67d503251762957c388c3e5bfc00d8d075ea3af813f994d08194a756e7d83088143abfe09a72991f66d61b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}