{
  "manageEntity": {
    "action": "Save",
    "entityId": "614516288",
    "entityType": "Track",
    "nonce": "0x0ba72d62b9de4d7bed703a3573832eeccd20eb36a10e0f89cfa8504526d95f2e",
    "signature": "0xda988c964a9b30d2e657b76ed55ebd2a1bf7be0d3f53baaded58e06fbd6aefff4067f5808b92721ff1adce692b5102234d25f73cf458267e7d6b150148f76f111b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}