{
  "manageEntity": {
    "action": "Save",
    "entityId": "1449773365",
    "entityType": "Track",
    "nonce": "0x412ab4b2dfd41061bd84813344679adc7ecdaf5950aa9be124bde4ff0028b6bf",
    "signature": "0xa3083efc83267f0ef7f144a0dc05706b9c94d0b93652b2ce8c3aef9687c56f4b5d92ceb29bd5c86f523808c99d63e1dbfe117df5840ec533e7a95bc60854110a1b",
    "signer": "0xd648B38B61b65e4F8df57D4EE65560D8DaacFDb2",
    "userId": "277314120"
  }
}