{
  "manageEntity": {
    "action": "Save",
    "entityId": "721788",
    "entityType": "Track",
    "nonce": "0xf329e2b7267b9d57150bc5afd845301549842f029fbf1be2ce0a544f704e86bb",
    "signature": "0x3fab4320e531baa1c231ab0cf941bfd33f5cc82cb0475d32c83fa9042aabecaa29109f67490c9779ec598feabe7b48287b2024cdf06d4fd0df287fab7ca0e4711c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}