{
  "manageEntity": {
    "action": "Save",
    "entityId": "814068547",
    "entityType": "Track",
    "nonce": "0x7cfafab1da06635a8a059bf215025978cefc618c25fd0482cce40030ac313813",
    "signature": "0xe873d7f25cd9251670c26f00d67736c336357d5672fc4bf1a4d0e81f4b44387830dab1d91fbd623b73a08287a5f8441db1e69af5c128407974bcaa0ce27620da1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}