{
  "manageEntity": {
    "action": "Save",
    "entityId": "448377",
    "entityType": "Track",
    "nonce": "0x66cfb84a852675e63f8df7a83c2465c60d795b2755add7365752b297e5907d7b",
    "signature": "0x520533de8098bdd58845d9baf741b1db44574c151ab85b363bf23cdc7bce1b453aa6e6bce0186baccb2b764c14876a97ed1e125bc7c1fb2389eaba85edacc4e91c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}