{
  "manageEntity": {
    "action": "Save",
    "entityId": "558360694",
    "entityType": "Track",
    "nonce": "0x2a0a487ee3082be011eee203f098a2b8bcf73675cbae4fb66999c0c6f18719b4",
    "signature": "0x6a71b06b2bf495114bb1b71e1cefaa1408557f94ebbe13dd02ccf76bb406db6e7ae09927c1854c4a8476169432fb5bdec76a638c0f03e26dd391580d56f51ef91b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}