{
  "manageEntity": {
    "action": "Save",
    "entityId": "21060487",
    "entityType": "Track",
    "nonce": "1787798908127539160",
    "signature": "0x167be9b23e8518efc178988fd833558f236fecd6cd0a7eede1f42ddb48a642ff058d0ab5a35897253b349c1cb426652846976b33963e0793fb4af9f11d6669221c",
    "signer": "0x23dF8876fD80368D375d911e3CbDFd15B8e85CB5",
    "userId": "827420993"
  }
}