{
  "manageEntity": {
    "action": "Save",
    "entityId": "2133998828",
    "entityType": "Track",
    "nonce": "1785674159810973966",
    "signature": "0x89469a4c8418944d88d17278e690b3f0017613d742923019ad4799bb3694d6b52962fa220e928374e0583757a7d0f20fd396beb789d694b3cffd91004c702a3f1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}