{
  "manageEntity": {
    "action": "Save",
    "entityId": "1654854709",
    "entityType": "Track",
    "nonce": "0x24a06a5a9f978761669f48889371005522e00a6d8b26c7125bd926c9edd556b7",
    "signature": "0xff95f34052b5a11292d4798687488e895f87b6b476b18491608628cc273e14fc6a85b4ad6e1efb6130237e3575cc3f933a28a4a8b95124b9e2c13337b938b5411c",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}