{
  "manageEntity": {
    "action": "Save",
    "entityId": "779905980",
    "entityType": "Track",
    "nonce": "0x65c143cbd1c4b8c9c76c4725b57b776fed8d316c52a705aabb6abff4008fd5ab",
    "signature": "0xf67cf01a03f79be56f3b62c5f40d365c65f9da64401d1688a14883f5d53290073d166d347c616d4d089a95446fc3107f942d1083d947585d0a6c700e97b903f61c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}