{
  "manageEntity": {
    "action": "Save",
    "entityId": "1518022140",
    "entityType": "Track",
    "nonce": "0xa3c33900d71071191bacbcd5337b0ffe2a36da5057d664aa6852a6229a6e72f1",
    "signature": "0xf7fe0904e6d608184418718367b42764f666a16f5ce9e7b1c91eae7802bd13446a09c4db7953167b859b464a6dddad79a5994ef633317581159243c0beba20f71c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}