{
  "manageEntity": {
    "action": "Save",
    "entityId": "1401346097",
    "entityType": "Track",
    "nonce": "0x373cd4036c9d06aaf1e052c6272315cc7b2a937edaac24a88ea7cd3236305aa2",
    "signature": "0xa4bf45146c19c24d917f73196bd0aaba4e3aa395ee402be0d27245f4f6f2f9be21f6a69beae59b348d85410bf0152743ab4f3763f6145040d5235d15ccdf6a421c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}