{
  "manageEntity": {
    "action": "Save",
    "entityId": "1209257500",
    "entityType": "Track",
    "nonce": "0x565c69d3e8a12d456d99b25b5422c3c7d7a1c5479105ef56c51ca5afd0d98c60",
    "signature": "0xdeeec0efbe0f48bc14a74d0434b773d06a80338f9e4c3edbae527d04470989f6609172a43c78a4db4498c9beded7eb7f8ec14bc0b0bb7ac523a7f026dbb101b21c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}