{
  "manageEntity": {
    "action": "Save",
    "entityId": "577207801",
    "entityType": "Track",
    "nonce": "0x6514beab19cc42092e60590e5088d4ce3a5c50f1d24bd91297abc1a53e52734c",
    "signature": "0x942cdce83b9ff0d3fc95a762565dc6568503d55d1ab08e6679034a299e5e172d0b77cb8f7e35a42ab338df041ebc8ce3a3c3a61becbe010606faddeae14667da1c",
    "signer": "0x38648cAE6c1E69869B895d522E9Bd0f99400A573",
    "userId": "859952725"
  }
}