You add at least 2,500 sats and then pass it on to someone else until it's pretty loaded. Then it's usually donated to a Bitcoin project or charity.
How does this work ?
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Discussion
Also it's polite to do so quickly (within less than a day of receiving the torch and next hop address) and to publicly post a link showing the transaction in any publicly accessible explorer (such as http://explorer.blockstream.com/liquid/).
Indeed, just in case someone steals it! 😅