{
  "manageEntity": {
    "action": "Save",
    "entityId": "615684826",
    "entityType": "Track",
    "nonce": "0xa73de0c8a3b55949ed805a2a196c8300e3424e920536391abe965ae283e16315",
    "signature": "0xe89a8dc83730e9940fa0cd25617defbacd80ad47437842b4b96647152840781d6cf2fbaf3428b0a0c6babc8b6574ae8fe0b59004ae13cdb29ef91c0128e86e701c",
    "signer": "0x8FF85C5AA450a88f13FbD5170e24E2a3eFF32518",
    "userId": "311829956"
  }
}