Opensea Escrow Service

Open the page of Opensea below.
After the purchase, buyers can keep the HACD on Opensea or swap it back to the Hacash chain through the guarantors.
Hacash.Diamonds Officially Certified OTC Guarantors:​

How to swap to Hacash

Visit the page "Buy on Opensea", find "If you're a HACD buyer" and follow the step to fill the form.