{
  "manageEntity": {
    "action": "Save",
    "entityId": "661301890",
    "entityType": "Track",
    "nonce": "0x4d96330d280d072f996765a84eebdbf45d08553f8cd92b90215b950ff189698c",
    "signature": "0x32be66fc928e419bd8d8d64c895b0467272037484ed0cf15863f4d42840c86ca3d74da7f1bab587f0fb5c66dd167993f009e543b8b187e18cfbcbf83d87cd4a31c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}