{
  "manageEntity": {
    "action": "Save",
    "entityId": "129784485",
    "entityType": "Track",
    "nonce": "0x55098576130ad976e238e98fa8c5c6f5ec7f931cd129d9a32b19b0b0fea6bfd5",
    "signature": "0xc17b6feca57ecb7e7903404cef4ec613b468cc33cfcc5874a8a2840e2a86912a6c8930102af8aee1043e43328212b65d40ae1c10a1fd18cb5535224ff533a13b1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}