{
  "manageEntity": {
    "action": "Save",
    "entityId": "470520",
    "entityType": "Track",
    "nonce": "0x75742293cd7736e805f556475c171bb9875fa44f1cb578ea0bdcc3e59a5d86a6",
    "signature": "0x7d08a60fbdec27d4e0131d9e3dc78b222fd219e4542b1a81b5a3de5ef6b741ac431eca11aa28cb69d11efab63c8006c6755c2a9d8914002cc2bfc5be8a38465e1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}