{
  "manageEntity": {
    "action": "Save",
    "entityId": "814258946",
    "entityType": "Track",
    "nonce": "0x4365514ea3011979767af3a2ee3d1c734fc55a493b769c239e50c4b6916738e0",
    "signature": "0xe3202a4315065063fec4bf15137d5bf05f1c53d0c252e400396144d0f9c315162c3e99852d08d1d49a3b33372d32494a912e6c972740c53deae1a1fb63e3d9971b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}