{
  "manageEntity": {
    "action": "Save",
    "entityId": "587121",
    "entityType": "Track",
    "nonce": "0x904c19521522420fd5a5e652a0083ac1a0b0e6d22cb35b6f919d7cf6a50448f9",
    "signature": "0xab23b155d469c9a7ed3f6d0a4a1c470053efff30f96ca0449116ceec11db551e72d92e6507585a8e0f51590c602202e8e70e44dcf96fcef363fab73096bf2ecd1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}