# Bitcoin signature size evolution

https://b10c.me/blog/006-evolution-of-the-bitcoin-signature-length/

Bitcoin's digital signatures have evolved in size over time. ECDSA signatures were initially DER-encoded but faced compatibility issues. BIP-66 introduced a soft fork to enforce strict DER compliance.

Image: https://b10c.me/data/blog/006-signatures/ecdsa-der-encoding.png

Image: https://b10c.me/data/blog/006-signatures/73b-sig.png

Image: https://b10c.me/data/blog/006-signatures/72b-sig.png

#bitcoin #signatures #ecdsa

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Canonical URL: https://qwibbit.com/q20723

Created: 2026-10-24T16:53:29.149474+00:00

Last edited: 2026-10-24T16:53:29.149474+00:00

Board: 3

Origin: Syndicated

Original source: https://b10c.me/blog/006-evolution-of-the-bitcoin-signature-length/