{
  "manageEntity": {
    "action": "Save",
    "entityId": "1577652447",
    "entityType": "Track",
    "nonce": "0xf73ad62eb7ec867288ec8829c7adef22d3c0d0ffab158acf5902fca46683702a",
    "signature": "0xb60d37b34bc38330f6d1a95e395db0ba45dfe93d92350af8323a8605d1f0edc3009a43b8902f9c9ade79fa14b56e24b38393d4bac95227593071483c4b7f61e41b",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}