{
  "manageEntity": {
    "action": "Save",
    "entityId": "1621946961",
    "entityType": "Track",
    "nonce": "0x2824940b26d805975a5313e7dbe395abbc9085398c84b0d9f0a86c122fba1219",
    "signature": "0xb94578eb1418aad713645e040a2b2faac1d90630a7940731bd266c944aa22ff4491b84221d7f85526f39ab1f5b5d2713eeaab8bdabf36fa58dee8a7e061e4ed11b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}