{
  "manageEntity": {
    "action": "Save",
    "entityId": "463333",
    "entityType": "Track",
    "nonce": "0x49150ccc591174c1d44b4dff287b31bc383c0e9955174e7f252168b467c4705d",
    "signature": "0x25b7ce4958abf61aca1a8ea20a4868cfda20c174ad9c7c3ce0ac883af33136ed3d72d234ea568a03e57c2a9efe853127163d006e12d8293dcee453e7c9d1cbe61b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}