{
  "manageEntity": {
    "action": "Save",
    "entityId": "1984821525",
    "entityType": "Track",
    "nonce": "0x09a1b6eec5b2eb0581a22c1a6efb299ccc5e6adf602f5d8ff63ba43f3643ff2e",
    "signature": "0xf74503df6fcd59087c81a00c2483e6667ab899cff06ac65f4758b06c61fd1aae56c6c8ba01631b14e5a3879e0ff402c93d772e6f3d94a7cc6c1a195b899d4af51b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}