{
  "manageEntity": {
    "action": "Save",
    "entityId": "820300663",
    "entityType": "Track",
    "nonce": "0x5805dd7d1bdbe6714f33557c717b72f5ab05e7c3bf51d85caf612b133a104036",
    "signature": "0x057debd6d36e6eb3fd3cb5c664c53902f858870e7aca8088d94b24afe07115bd066369f7bc6a605d7f3059b0bf580b3d72354761b29515b7561046115c2957771b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}