{
  "manageEntity": {
    "action": "Save",
    "entityId": "642723797",
    "entityType": "Track",
    "nonce": "0x48b21d451b23799cc6136a25c96ae227c83a4576dfe97832ca5de8de7db7e087",
    "signature": "0x7c484011122537572c328944af2b7d8c3f0546cd63b2b50c7ad2ffae407cdb7c132ae41e56212cceda5b0103700cd49290d0d7cda21476b34087ae0df0a575a71c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}