{
  "manageEntity": {
    "action": "Save",
    "entityId": "984605",
    "entityType": "Track",
    "nonce": "0x04381a27e08976c4af10a47e6971585202a084f79e6c0aaff7673026490b9169",
    "signature": "0x37d03574475df97653de518aaf45d3034319e2d00d983f4ca68fd306bda923700a867a6b22db37bdd0403349949f83178836bfbc7cff9aa94f30654c152c43671b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}