{
  "manageEntity": {
    "action": "Save",
    "entityId": "673280629",
    "entityType": "Track",
    "nonce": "0x010dacd3129c949a72087bd57406791d89a2022de1508c0718e9c2e5b4819aa8",
    "signature": "0xeaa77296fa2aa6363c1c69197fa50fecda89c6f2b3cf40c5cf5d3be7447e73ce0b793ecc184cbefd74cf745229bb2a2d42430cf3e2963dc99b85911583cd858d1b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}