{
  "manageEntity": {
    "action": "Save",
    "entityId": "388924",
    "entityType": "Track",
    "nonce": "0xb4837d7c805402b1356a4d26c96906d090f52102b2f5000c08627a0ec43dc411",
    "signature": "0x07024d447ddad0dc825a62fc105a50caf5eefe1ae2061d6bc9ab45865069e6331f3fd121a219c69bee95f3d69883af4a1e1e1ed5c8b4778ee643652c0fb98a211c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}