{
  "manageEntity": {
    "action": "Save",
    "entityId": "963998754",
    "entityType": "Track",
    "nonce": "0x1955c9ed9a7b800772ae6710461d5255f00de814d89a572ad8cfe211defe8084",
    "signature": "0xcb7599fab8136d08b4a8d0f7c7a43eb97357ecc1ecaf0d46e86f563ef3df7c8152263a8687fa8cfb4086843a76662f677d367cab67daba7a3607691894b738ba1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}