What we need is an oil barrel subscription service. For just $20/mo, they'll deliver a barrel of oil to your house or business. For $25/mo, they'll throw in a bucket of coal. Makes a great holiday gift.
Wouldn't it be better if I store the oil for you and give you a certificate instead? You could buy it instantly and you could just email or whatsapp your christmas gift of coal...
Even better if the certificates are cryptographically signed in a chain and their custody is verified though a solution of the Byzantine generals problem.
2) wait for delivery
3) cry when you now have 42000 gallons of toxic sludge on your front porch
4) wash your hands and maintain appropriate social distancing