{
  "manageEntity": {
    "action": "Save",
    "entityId": "545522",
    "entityType": "Track",
    "nonce": "0xda12144e4654f44060d1e65e1b425acbcedbaacba5eb22196cfc954319387577",
    "signature": "0xa854deb9d679346c71c1d665c44b791b36e656be6df60e3e993f6975c75b86c64e684ae3e6907a6ae792c9c8c6a2806b89f8b124d44e289f2a33a3803f6695351c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}