{
  "manageEntity": {
    "action": "Save",
    "entityId": "723490",
    "entityType": "Track",
    "nonce": "0x13a4eff0cafa78d43eba683e337875b42cbc391056b352551ccb64383da21844",
    "signature": "0x97c51dec210f7bc8567aae872fbdab20495c75880615f6a81a28e4a94501d8507599722d4955c326f6af661deaedbc1d647483af742a5fe052ad12a52c1651791b",
    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}