{
  "manageEntity": {
    "action": "Save",
    "entityId": "1016335",
    "entityType": "Track",
    "nonce": "0xe87ac91c68b121f1a03c3912865ff0afb9ec2bfbea3e1cc80a0188e583a9209b",
    "signature": "0xab0b61729528b540e1af57f9876fe5eb3ea42833385bd70c5e6b013fc27c61267e1215518f22ca23832b4339ccea80e17c8ccfc581f92bef675a171b0a1ff5021b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}