{
  "manageEntity": {
    "action": "Save",
    "entityId": "1393860408",
    "entityType": "Track",
    "nonce": "0x54c62cc10d431c1fff0b51d04af72b9b345c019bc632c17b0ec915a574540fa0",
    "signature": "0xd255a2fe41ac3cc3c76d38a33ad44015c236dafdda0a005e51f3f95370408a716bc7b27378be584adc338f21496997e12d05b3e07c83497b9fa2b2836767b0011c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}