{
  "manageEntity": {
    "action": "Save",
    "entityId": "604564070",
    "entityType": "Track",
    "nonce": "0xbabf1e0d014c36c05c8824f5c7982bb31fc3771593cd552ccc6753d3d3e64635",
    "signature": "0x7954f71ff4176af93901a4f73bb2c2fc09157278c3835ef2524b1b16c1d2ffaf525e5899463ad4c35067831d96e16bd993d9905654add9813df38fe3352d5b201b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}