The strongest directly fetched source is the SEC press release 'SEC Emergency Action Stops Digital Asset Scam,' which clearly confirms Robert Dunlap's involvement in the Meta 1 Coin scheme and the false claims that the coin was backed by art and gold. That source strongly supports the core allegation about fraudulent backing claims. In addition, web search results surfaced a DOJ press release titled 'Texas Man Who Orchestrated $20 Million Cryptocurrency Scam Sentenced to 23 Years in Prison,' whose snippet specifically matches the user claim on the 23-year sentence, nearly 1,000 investors, and 2018-2023 timeframe. However, because that DOJ page did not yield substantive fetched content in this run, those exact sentencing details remain only corroborated at search-snippet level rather than fully validated. Overall, the claim is likely true, with medium confidence due to the partial validation gap on the sentencing page.