Dust
Dust has 2 meanings
Tiny amounts of cryptocurrency
Example
I figured I'd be able to spend that leftover Bitcoin on a pizza or something in the future, but now it's just dust
Dust definition by Slang.net
This page explains what the slang term "Dust" means. The various definitions, examples, and related terms listed above have been written and compiled by the Slang.net team.
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Dust is small amounts of cryptocurrency that a user can't spend, because the fee to conduct a crypto transaction is higher than the dust's value. For example, in March 2021, Bitcoin's transaction fee was $18.58. So, any amount of Bitcoin worth less than $18.58 was dust.
Because Bitcoin and other cryptocurrencies' transaction fees are variable, any amount of cryptocurrency could hypothetically become dust. Continuing the example above, if Bitcoin's transaction fee jumped to $100 (not unreasonable, given the transaction fee was just $0.59 in 2020), any amount of Bitcoin worth less than $100 would be dust.
Cryptocurrency users with multiple wallets often try to consolidate their dust into one "account" when transaction fees are low. Sometimes, malicious entities perform dust attacks, sending users dust in hopes that they can track the users' transactions and engage them in phishing or blackmail schemes.