{
  "manageEntity": {
    "action": "Save",
    "entityId": "1472345880",
    "entityType": "Track",
    "nonce": "0x5ed396fc4e637624029ab4fd9e602b8567fd9788f49bfae0d028f1fbd05d615c",
    "signature": "0xc3a4ab436959a52e77cf50a57d82512b574058cf7c1e5a6124a81e2ba5505edb05c995d25d7b897fea074bebdf32e7eacb22b5f40112cb5c9e10d960d7aa65b71b",
    "signer": "0xC7B16Eee24C03712c67aa884907593f4df23db87",
    "userId": "56534466"
  }
}