curl --request POST \
  --url https://gateway.varchev.com/crypto/unstakeAsset \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'tenantId: <tenantid>' \
  --data '{
  "nonce": "-51296282",
  "asset": "XBT.M",
  "amount": "Duis consequat"
}'

{
  "error": [],
  "result": {
    "refid": "BOG5AE5-KSCNR4-VPNPEV"
  }
}