{
  "manageEntity": {
    "action": "Save",
    "entityId": "646762926",
    "entityType": "Track",
    "nonce": "0xff5545e9811e74c5e2dedec93e196bbefd48268a491393f67208d5b7bc82fe1d",
    "signature": "0xed96322d0d344e4ddd0c46997037bff329771fdc999ac9aefa9c59224b834e0559e05c40a803fbc25a2121e7e8eb67ada294d08a6151b1b538ade65b4a06813d1b",
    "signer": "0x39BbEb25924EFA2144235AA6b9287C30dA0bEF8D",
    "userId": "320790987"
  }
}