{
  "manageEntity": {
    "action": "Save",
    "entityId": "1148729199",
    "entityType": "Track",
    "nonce": "0xc4f2595f9b601b222829ee2dacf39931114d09e2a86a0f4dfee9faa14b4efe89",
    "signature": "0x935d94216b8f1d017c5f69ccf5ffd803af0e7c6774f0a2fdff8313a70a4bff6a40d0b9cd4d94e7ceb3dd3f539acf997911f02b2ee4271876a499a8440c4e19831b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}