{
  "manageEntity": {
    "action": "Save",
    "entityId": "1103208128",
    "entityType": "Track",
    "nonce": "1788614403613901442",
    "signature": "0x24b8b8648d0c558a5720e06f89039c100d73df90c14866dec2f4f71ca7af54325c5d8c158362351624b8657e22854d6e006bfb0bf75ed8ba1167bfb11e5114921b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}