{
  "manageEntity": {
    "action": "Save",
    "entityId": "1721106194",
    "entityType": "Track",
    "nonce": "0xe391417af02225df89adf89f1e48a85929768d8e5cc4e1d59737b6fe7c1efbd8",
    "signature": "0xdb0680e86e7810d4d0885eda83c8f4f0e77ac8c020e99a4dc616f6019de8339456cd62ad421153c2406dad133d74a81c568c8d3da4cb2cbcdf569fdb8e4af8351b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}