{
  "manageEntity": {
    "action": "Save",
    "entityId": "812449407",
    "entityType": "Track",
    "nonce": "0x1bd39104a96423fb9cd6c7cc61c67526a3f2c5a6e589ff001c3873a001347be1",
    "signature": "0x57f6d2b90d30032243cc7c7b1c2a15a493203b75562507c82f133e6bf23beecb01cb2d7d0af6b5d56c81ecae57af5997d09686b57362da4b664cb640531273201b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}