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I define marginal fee cost as the number of bytes required to add that UTXO as an input to a TX multiplied by the satoshi/byte rate of the blocks being found.

So for a normal p2pkh UTXO, this would currently be roughly 180 bytes (number of bytes this UTXO would take up in a TX as an input) * 200 satoshi/byte, or 36000 satoshi. So the answer would be however many UTXOs exist that are 36000 satoshi or below for p2pkh. Essentially, I want to know how many UTXOs are currently in the UTXO set that would not be worth redeeming should the fees be above a certain satoshi/byte.

I would like this data at 100 satoshi/byte, 200 satoshi/byte, 300 satoshi/byte, 500 satoshi/byte and 1000 satoshi/byte.

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  • 1
    Interesting question! Note, that a P2PKH input is 147 or 148 byte: How big is the input of a P2PKH transaction?
    – Murch is on strike ♦
    Mar 7, 2017 at 10:16
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    Yes, that's for compressed pubkey. Uncompressed would be 32 more, which is 179 or 180, so I suppose it's impossible to tell which is which. Same with p2sh, which can have any redeemScript with compressed or uncompressed keys. An estimate is fine, though.
    – Jimmy Song
    Mar 7, 2017 at 13:27

1 Answer 1

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Here are the results at block 472236

Processed 41823253 P2PKH txouts

  • Fee is 0 satoshi/byte: 41823253 txouts are spendable having total value 12504138.52 BTC
  • Fee is 50 satoshi/byte: 28693175 txouts are spendable having total value 12503686.97 BTC
  • Fee is 100 satoshi/byte: 21753912 txouts are spendable having total value 12502819.35 BTC
  • Fee is 200 satoshi/byte: 16426255 txouts are spendable having total value 12501503.34 BTC
  • Fee is 300 satoshi/byte: 14808011 txouts are spendable having total value 12500784.29 BTC
  • Fee is 500 satoshi/byte: 13208366 txouts are spendable having total value 12499668.03 BTC
  • Fee is 1000 satoshi/byte: 10998782 txouts are spendable having total value 12496954.83 BTC

This output was generated using a fork of bitcointools. This script reads utxo from .bitcoin/chainstate directory of a bitcoin node. Feel free to fork/use the script to generate related data later.

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  • That's a great collection of stats. Going back to the original question, how many txouts are less than what's now the typical transaction fee?
    – MrJLP
    Jun 21, 2017 at 16:38
  • Hm. Are you saying that the grand total of P2PKH txouts is 7.4 million BTC? Given that about 16.4 million BTC have been mined, that's surprising.
    – Nate Eldredge
    Jun 21, 2017 at 17:24
  • @NateEldredge You are right. There seems to be an error in calculating the value, the number of txouts is correct p2sh.info/dashboard/db/pay-to-pubkey-hash-statistics?orgId=1. I am checking the script for errors. Will update in sometime
    – dark knight
    Jun 21, 2017 at 17:43
  • I mean, it's not impossible, since other transaction types do exist. But it would be surprising if true.
    – Nate Eldredge
    Jun 21, 2017 at 17:50
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    Random request: it would also interesting to see the total number of utxos in each category (to get a feeling how many bytes in the database are effectively dead weight).
    – Pieter Wuille
    Jun 26, 2017 at 1:07

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