{
  "manageEntity": {
    "action": "Save",
    "entityId": "520251953",
    "entityType": "Track",
    "nonce": "0x002ca458575b6d1ca60a0754d74d51e82f999e2bcc298463551e6506e01cd63d",
    "signature": "0xc65f36eae506ca32b20f0ea96d122ad2f339ac1d8fe8f96288da42e9a4db33f154de7e3461bc360cf78a21e8eb46c3a68efb0ba6262ba3fa7c9ca4a1989d898c1b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}