{
  "manageEntity": {
    "action": "Save",
    "entityId": "752653540",
    "entityType": "Track",
    "nonce": "0xfb9ea9cff75d75dbf6c3094a2d2e6cb297991878416ab974d1805509930906f7",
    "signature": "0x114bc924f4392d1e70429a31489ab587b0ed4e7c0e36fd15960e77b446915c152d2e3fd008f23df381a190215d555cccfa8f82c1c62da88e850361cc8304a4581c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}