{
  "manageEntity": {
    "action": "Save",
    "entityId": "1907448598",
    "entityType": "Track",
    "nonce": "0xbbe2f21f6bab6c07eef0ad3712f0d5ceaff75d643d41a538aed35f79e937497f",
    "signature": "0xd19188795c11d670e43cb7c7fe23ef5689be34e0ddd6d759c74a033be9aeaaa56d5f95319b9718a01c85d8fa565767e88cecbc9260d20bedf57b7faf6879e9e41b",
    "signer": "0xf63b89A0Bbc03C7ec59aC257C7082A056082cDB8",
    "userId": "558452493"
  }
}