{
  "manageEntity": {
    "action": "Save",
    "entityId": "1389471857",
    "entityType": "Track",
    "nonce": "0x5f0b8791ddf1b99cca6e1fa25a4d7fd51cb071027be52b0161f14336c744c310",
    "signature": "0xab68bfea857d60f2c2759db331994637d84e5436ccf14b27ea57eddb6393ce0b62e922a6f8c62d4cd3ed1c96ff35d3d3d9a9e5c6cb175a739246827a5a7aaa9f1b",
    "signer": "0xe9B3548997c57545A6352D16A021F6df1a01747f",
    "userId": "616597835"
  }
}