{
  "manageEntity": {
    "action": "Save",
    "entityId": "820246",
    "entityType": "Track",
    "nonce": "0xb42b4ccf1dada09134045a7350fef4f97e830c3377e514657089e2c30860fd75",
    "signature": "0xf5804adf63eb2c6a59e07818d78d25725cdbb95cfb6cbfc00d7182ae30b5cf1b4e21aeb275c3da0b1eb04df90b4c39090275f45f95de9dec047a364d2add3e211b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}