{
  "manageEntity": {
    "action": "Save",
    "entityId": "587589774",
    "entityType": "Track",
    "nonce": "1788187618616198708",
    "signature": "0x9df8239b3f3e503900525a8735ef266e90af0d6feda247cca57dda5d0e178bab1ef3cb9d3eac6649087a616c760afa08ca55d2904664215889cfb5d27c7bac751c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}