{
  "manageEntity": {
    "action": "Save",
    "entityId": "1543556489",
    "entityType": "Track",
    "nonce": "1789978260125738242",
    "signature": "0x8cd7e106378eae703f420a68b5408763197ac93927dd52acbdd509a9531f3b4b40b1140397f31c02d007f9cce53d40a3c5ff83f85aa6c0e1f7986dcaec6d9cfc1c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}