{
  "manageEntity": {
    "action": "Save",
    "entityId": "370505",
    "entityType": "Track",
    "nonce": "0x3832990c245d177863840a1bff309a7ba787003b791594da6a6b436647cdf0a7",
    "signature": "0xce7e40b0cebb9c89d2486edb4ca6fc76dcd73f6b85e2e26ca9cf80a0afdf3ef34fd0faf69a57fa6d96354038896cfb2ab83ae9a97df8244ec11754a09601d81c1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}