{
  "manageEntity": {
    "action": "Save",
    "entityId": "374701",
    "entityType": "Track",
    "nonce": "0x487c0c90934bf2d04b8fc1194b93797d64464f184fb75ac6ccdd8bbf2973ea92",
    "signature": "0x52f740002a835484c91bf843de587f3b0f561321bf377166ceb1db6106301ae07f9e0380322c677c52a80b004b44b9020821800af851424201bf7c3d4eb238481c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}