{
  "manageEntity": {
    "action": "Save",
    "entityId": "1645475014",
    "entityType": "Track",
    "nonce": "0x47a485b5163357f4128747a72c797b730bb02bb354485c280779cc7dd2c32391",
    "signature": "0x43b80c17070065afe67f38009ab3df68f7e057f39e25944406baf6e7e971dfd84edb713117ddb346c0dcd71b01e6f27ec45f436bc13c053670cfa95dde26f98a1c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}