{
  "manageEntity": {
    "action": "Save",
    "entityId": "544928298",
    "entityType": "Track",
    "nonce": "0x53de5ed13139425449df5d44fc2fe81015058e01f619104608eb00371b543aac",
    "signature": "0xb80ec1772e5d8a064aa2af270a8eb26b25b5e1b9908c59cc856c0c0f60ddb3906114204cb6c3f5786a5954fe88927e8ba4964dc64f8dd791edafd72fc0b4a8761c",
    "signer": "0xF08935327AeC6306C8d0eb92999567e5496848C9",
    "userId": "989073793"
  }
}