{
  "manageEntity": {
    "action": "Save",
    "entityId": "606998639",
    "entityType": "Track",
    "nonce": "0x478487642067691618c14715e2be4f2f68ed103cb9b99d3056472ee47e812bb9",
    "signature": "0xa2403f5870536172b42e93372df80b6141dd63f12fe77506e80886e3d85466006cfb35e2bc0b9ad056c7e74f350f2e88dffda52b63b1350bf601e09877225fd91c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}