{
  "manageEntity": {
    "action": "Save",
    "entityId": "750405916",
    "entityType": "Track",
    "nonce": "0xfe8519d925a3b9f3d2f2aacc685904fda1bd45e161e8fb64a7d8bca7269cd933",
    "signature": "0x52f85b47b1852b7e60ab43cbd76a68177709f1942c4c1f48dd7abcfedb9723de64f9e725646825f0c72bf968d7de457339116175c415952b5bf6655bb9e1a4d81b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}