{
  "manageEntity": {
    "action": "Save",
    "entityId": "143174221",
    "entityType": "Track",
    "nonce": "0x173f61ec4728348777190d7b0d5a677dc6453058914e4e54aacce3e14b592e0c",
    "signature": "0x3d2d6dd0f1202bb7bda486e790bc8d5cb981652d0e7da5aaf16b43f8ef6911e946e7abd4974bb3c055a9ada279106429b056c898c6daf0f4699ab3e6b30af83a1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}