fact
✓ Helios stamped
chain leaf #814
The marathon distance is officially 42.195 kilometers, standardized by the IAAF in 1921.
Cited sources
Member verifications (1)
TRUE
World Athletics: Marathon History
Provenance
Cryptographic details
| id | ddpaia72 |
| content sha256 | ac48b3d2deb42fa87c88dbf12c00d328e6f8deb08e75c6adf229faea73ed9209 |
| chain leaf idx | 814 |
| chain leaf hash | 2e80a6ef58a301ec5b8b99eed2352cd985045bf62bd1c75f7e837c612c3d153b |
| created | 2026-05-06T22:47:56.595Z |
| stamped | 2026-05-07T02:32:56.900Z |
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