{
  "manageEntity": {
    "action": "Save",
    "entityId": "310729",
    "entityType": "Track",
    "nonce": "0x1f12c007e1b050acc5a0e51c9f81a3677598c35de006d8cd6636c56fe79ee7ad",
    "signature": "0x7608a2d74fd77e4d24835a567b536e81d353a9927978ed2381bb02d9a62efd600a663a27c86b1a6db5840eff710177f918d5ab8f0748357eec13a1069c422ff51b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}