{
  "manageEntity": {
    "action": "Save",
    "entityId": "678281825",
    "entityType": "Track",
    "nonce": "0x230f2c976e5a216c462934934a3c57a4306139db0689109f06b1399e283d2e58",
    "signature": "0xa9dbfea63cb32612b0c68e81a671b2444aa205a507efe7f1bc1d3fe1fd9269892ede8975ebb299b633a41e75cdcabc3fd78d90a91f74d53ceaa799ff935f4f931c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}