{
  "manageEntity": {
    "action": "Save",
    "entityId": "673888",
    "entityType": "Track",
    "nonce": "0x835d3725dbc603d614516a866b4e1068395c6855c50e838749b5ff0bf9d992a2",
    "signature": "0x91bfa1b95980adf4570ce7beb8fc24ec3e125ba3622bfac2c4f8c33fa1f2bd3e60fb6db7d20c393372c195d8ae355fa8ab7ad252982c513f26f405334d5a524d1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}