{
  "manageEntity": {
    "action": "Save",
    "entityId": "139650853",
    "entityType": "Track",
    "nonce": "0xcfa4291f4f575b219d0ec1635b853a3b0a9d555de6b8eeb5af68e2f6cc72ea1d",
    "signature": "0x52d08eb55b7c2acb7731448b89f7ae3e632708341ddd544dbb2c0e073f3b72e400e8b25401d85299ead0987a882ce63cf7609a7ee6113f515c7aa059865e37f81b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}