{
  "manageEntity": {
    "action": "Save",
    "entityId": "1608470505",
    "entityType": "Track",
    "nonce": "0x7de99bd02d69808dbe6a1e886ac001730a1416350b8a0ab57b5ea7a070d3ca18",
    "signature": "0x6c0b546b9d91f8ffd292fc2fb9e1d81905a649eeffaa684d4b96cc4b0ea330e24a31b13edf38cd6d8b362d7f48f5c39463455ef0f312311329092c1b861a65631b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}