{
  "manageEntity": {
    "action": "Save",
    "entityId": "1977050305",
    "entityType": "Track",
    "nonce": "0x5684d0443645540bae5de3363a8e3dca576bb73eba9dcbc8e8c9f66088f9b49a",
    "signature": "0x3f95aadc2eedca777a36f0b625b029435fbef461ebe9f218782f4846460f6613712f5e110e16add184c69c36d73febf150aa6322e91672e3d3b1f99db0e8d1751b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}