{
  "manageEntity": {
    "action": "Save",
    "entityId": "21738",
    "entityType": "Track",
    "nonce": "0x140be7be22fcf554c1f29b91879da18d9d54223ca35ac8a32b42b7b2d55ad698",
    "signature": "0xe7c6f4f1aca95941f6333240960d2aa451b2d74c0d404d8f288f3b9a3f8a5aab2dab98f75a3931bcfee9d35c401654cfec329f27f114d4fabd4690b6fb225e3e1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}