{
  "manageEntity": {
    "action": "Save",
    "entityId": "512906312",
    "entityType": "Track",
    "nonce": "0x60e6c9eba9310d07074a52d3cfb67e3bc373d209fa03581230a503c1d6cdadff",
    "signature": "0xa40b818d58704b3ace5d6484ad1931580cd1002b2d01fc23512946ec027255966065f3a80256128db9531099c6161cced986b7b3ba56edd0beeba3224af6dfd51c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}