{
  "manageEntity": {
    "action": "Save",
    "entityId": "343659820",
    "entityType": "Track",
    "nonce": "0x0336c4ef66abd96ab2cd2596cba13a81b5187e5aa347f911f98b1f9cea5e6ad6",
    "signature": "0x4b9fd0d9a6c53909a6bd74d0b41a3c3ca77cb9cbc0e46890ab0f27f6a875b17c6ff4d989a76a9b33277b8b3e099cca03034e475f7ee25d40360c8db280646e381b",
    "signer": "0x45C74e4f36E4e5064C5321eeED3748fD52B04eA8",
    "userId": "133970929"
  }
}