{
  "manageEntity": {
    "action": "Save",
    "entityId": "1437286779",
    "entityType": "Track",
    "nonce": "0x326eb263cb57becbd1362ac1aa9539146b550e0eebad3f45256bfd4dbb960524",
    "signature": "0x07e5d7a76a53ba973e30a12c164f628207427404eaee41e236d2b709482f256a3f17ea9f5e9068b06cf5bbb21064b65a77e7615b38f469718be10ce635bb0cfd1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}