{
  "manageEntity": {
    "action": "Save",
    "entityId": "883065677",
    "entityType": "Track",
    "nonce": "0x78a486d67b200a0ecc085603c0281e5ebc29348d17e01917ec158b8736717677",
    "signature": "0xa3f7b703211963efa0f00a370a9e998863ebda6f17650c095cf179c5201f80ac60c6dc55e445ed7766fa3f6604b07684d43c546e0e4c8a49587d02a9d959d10f1b",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}