{
  "manageEntity": {
    "action": "Save",
    "entityId": "1681418920",
    "entityType": "Track",
    "nonce": "0x15e1bf7876cdc7220c64cb1ae8aaeda285c372bac89ea695cd572a87f302033a",
    "signature": "0x3590e1c6a4552d719e882e9caf36824e4cb6eea0a3f24011e339f396d4780a302ba1081e8ec17b15a6e2647417557ea456d105e8d3fe109c9a73dd8028ac07a61b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}