Firsthand Bitcoin · Data · Bitcoin miners
The number of unspent transaction outputs, the pieces every bitcoin is stored in.
Unspent outputs (UTXO set) opened 2021 at 69.29M (January 3, 2021) and closed at 79.09M (December 29, 2021), up 14.1%. The high was 79.33M on December 24, 2021 and the low 69.29M on January 3, 2021.
| Month | Month end |
|---|---|
| January 2021 | 70.47M |
| February 2021 | 73.93M |
| March 2021 | 74.99M |
| April 2021 | 78.19M |
| May 2021 | 76.35M |
| June 2021 | 75.89M |
| July 2021 | 75.84M |
| August 2021 | 76.08M |
| September 2021 | 76.34M |
| October 2021 | 76.66M |
| November 2021 | 78.01M |
| December 2021 | 79.09M |
Bitcoin is not stored in accounts but in unspent outputs, each one a lump of coins that a future transaction will spend. The count grows with adoption and jumps during inscription waves, when many small outputs are created.
Other years: 2026 · 2025 · 2024 · 2023 · 2022 · 2020 · 2019 · 2018 · 2017 · 2016 · 2015 · 2014 · 2013
Also in 2021: Bitcoin price · Distance from the all-time high · 200-day and 200-week averages · Network hashrate · Mining difficulty · Difficulty adjustments · Fees paid to miners · Transactions per day · Hashprice · Miner revenue · Bitmain releases and the bitcoin price · Break-even electricity price