{
  "manageEntity": {
    "action": "Save",
    "entityId": "200222",
    "entityType": "Track",
    "nonce": "0x8b6ce44acdb5d41da96475b4d17b0114bee76cebe4f155652c4df0576f754f2c",
    "signature": "0x87ed632093df93e713b64b8d065d5d549e77d26c9a807a5f84af8c7e18b3a86c10d065313fefd6e8c6a0df5478f23c01799b00fb59480f849ac7da95802730501b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}