{
  "manageEntity": {
    "action": "Save",
    "entityId": "403446680",
    "entityType": "Track",
    "nonce": "0x8e5cea5b25e5163f6dd4a5ccba2c689967c000e76d0227493e330fc441c40fee",
    "signature": "0x3c6b8fbda2defddf79aa579a03972ede2b4fad56acbb5247b72e7920bbeb50e51931c276c8053ecdcf09413131ca4abb4302d58429dc715442a8ebd9ff6b02ba1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}