[lrvick]

Well I have clients that pay me in cryptocurrencies monthly, and I pay for goods and services with them regularly without Visa or Mastercard learning my purchasing behavior to sell to advertisers.

Sure cryptocurrency is not as widely accepted online or in person locally as US dollars, but it is far easier to spend those same places than my Euros which actually meets your definition of money.

[calciphus]

Surely if you're concerned about privacy, an indelible public record of all transactions you made in and out isn't the way to accomplish that?

[omnimus]

People will trade with amazon gift cards or weighted gold. The fact something has value and people will exchange it is not what makes thing money.

[lrvick]

money /mŭn′ē/ noun

    A medium that can be exchanged for goods and services and is used as a measure of their values on the market, including among its forms a commodity such as gold, an officially issued coin or note, or a deposit in a checking account or other readily liquefiable account.