{
  "manageEntity": {
    "action": "Save",
    "entityId": "648665509",
    "entityType": "Track",
    "nonce": "0xa867c5054776a4ccd6d165acedfacd613309e38e3b95e2aed2bbfa7fc4f0c37f",
    "signature": "0x1dc6024cc6b456f68f675734c5c0da1a3278138a07e1cfd75647a54481a1c1806ec2be1b8a9456491a140439aeb1ae78d90265fb4437ea3c91026daef50cdce41c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}