{
  "manageEntity": {
    "action": "Save",
    "entityId": "1932250144",
    "entityType": "Track",
    "nonce": "1788264819761728753",
    "signature": "0x2727eef98ab222eb9ad47866cefe2042d862f3a8e641261533ecd88272f02caf7a14f06e7f50be635689146b953c15e34576a3b40a6d62b7f04b27bf02ea37bd1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}