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A comment on Silenced AirTags with disabled speakers are popping up for sale online. Parent comment

Re:Silenced AirTags with disabled speakers are popping up fo... by duskwuff on Thursday February 03, 2022 @05:39PM (#30200053)
> Bitcoin used to do this: low value and/or infrequent transfers used to be free.

Miners used to include zero-fee transactions in blocks when there was space available. Nowadays, most blocks are full or nearly so, so miners have a financial interest in mining transactions with the highest fee-per-byte first and ignoring anything which has a low or zero fee attached.

There was never any special handling for "infrequent" transfers.

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Re:Silenced AirTags with disabled speakers are popping up fo... by Scoundreller on Thursday February 03, 2022 @06:41PM (#30200669)
"Input Age" was a factor in determining priority:

https://en.bitcoin.it/wiki/Miner_fees#Priority_transactions

Maybe I got it wrong: I thought it meant how long the coins have been sitting around, but maybe it means how long the transaction has been sitting unmined to make sure no transaction is left behind?

But it seems I'm on the right track, in that input_age was a measure of how many confirmations, which suggests it's about how long it's been since the last time they were moved:

note1 here: https://bitcoin.stackexchange.com/questions/95407/what-were-...

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