{
  "manageEntity": {
    "action": "Save",
    "entityId": "212499373",
    "entityType": "Track",
    "nonce": "0x36b8ff0cb3f4ab0ef2e42681fc33dec1cab08b492b61179964255ab8644049a1",
    "signature": "0xb2d6aee311a976650b014a78c37bc87c65e4734f2b31d5c596d80eef70c0f00f4c5aa7023f2578e53ec2565dc1dca1d06ccbe69cd252c08da1bfad8374782e9e1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}