{
  "manageEntity": {
    "action": "Save",
    "entityId": "1907448598",
    "entityType": "Track",
    "nonce": "0x3e80056a2985df858d7c504197e79922419e477266cd4976a92a63a3e4368667",
    "signature": "0x2c4c6497be8079610336fcd665a8780fdcbe9a234d8bf24cfe099bf8a7c8677d2d567295efba211669064a73b5b847c551cd7f3909775ebc1c77258e517e626f1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}