{
  "manageEntity": {
    "action": "Save",
    "entityId": "209291",
    "entityType": "Track",
    "nonce": "0x310e501fd75ecd7f1c74f82eb0eaff4a241208a0fa4a77ef79c72a6fcea25156",
    "signature": "0xe79d806a2e6b3f45d853fc1cb4dbc1b96f11a883ab559f11b5d6615b5b8de143207fa69e6f76a57f49a846892274dd02202a9abd3b37b54d9b5c03cf544a299f1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}