{
  "manageEntity": {
    "action": "Save",
    "entityId": "628749",
    "entityType": "Track",
    "nonce": "0xdd812c4a5e7cebd3510fdf5318259ecab767c7ff8c28128a1c7e97e01c4cae6a",
    "signature": "0x332c529b4e757ba3287224e8ea267ca75a28b33a18a56853bfb86565c60c487f7b2e8e097222cefbb83a432c51bbb3fc2b3ee87b6ae3d05cdc737f0a8a683ed21c",
    "signer": "0xCedE64dcD8b0FdEDBdADF4b0ba433797eD6301c9",
    "userId": "638733607"
  }
}