I contributed to a 2013 paper that attempted to address some of BTC's then known shortcomings, including the blockchain length but the our suggestions got no attention by the core developers. 



On Wed, Nov 18, 2020, 8:27 PM grarpamp <grarpamp@gmail.com> wrote:
On 11/18/20, jim bell <jdb10987@yahoo.com> wrote:
> Decrypt: Inside the Competition That Will Save Bitcoin From Quantum Computers.
> https://decrypt.co/48107/inside-the-competition-that-will-save-bitcoin-from-quantum-computers


https://www.post-quantum.com/

It's McEliece, them combined with DJB's group, see NIST competition...

https://csrc.nist.gov/News/2020/pqc-third-round-candidate-announcement


People are not very happy with legacy cryptocurrencies, they will
fall to new cryptocurrencies unless they address the following asap...
- privacy
- storage that grows only as function of UTXO count, not of TX count
- native tx rate
- pqc
- asic hard, cpu gpu easy




Users and the crypto world should subject a company, that believes
PQC should be pulled off the shelves, to the most severe levels
of inquisition, inspection, vigilance, and opensource audits...

https://www.ibtimes.co.uk/pqchat-worlds-most-secure-messaging-app-unbreakable-by-quantum-computing-1449591
https://hacker10.com/mobile-phone/encrypted-mobile-phone-chat-video-and-calls-with-pqchat/
https://www.telegraph.co.uk/technology/news/10845918/WhatsApp-rival-PQchat-claims-to-be-worlds-most-secure-messaging-app.html
https://www.silicon.co.uk/workspace/pqchat-messaging-encryption-quantum-computing-146089
https://web.archive.org/save/https://www.quora.com/Is-PQchat-as-secure-as-the-developer-claims

https://android-full-encryption.blogspot.com/2020/03/should-you-switch-from-whatsapp-to_37.html
"We're not asking the right question [when we talk about encryption],"
says Andersen Cheng, the chief executive of cryptography company Post
Quantum. "In the intelligence world sometimes metadata is more
important." Cheng said he developed a messaging app but pulled it when
it appeared on an Islamic State recommended apps list.

https://decrypt.co/48107/inside-the-competition-that-will-save-bitcoin-from-quantum-computers
Post-Quantum
’s ambitions ... The protocol ... was the backbone of its
short-lived quantum-secure chat app; the company removed it from the
Google Play store after ISIS started using it to coordinate attacks.
“Too much hassle,” said Cheng. “Don’t get me wrong—we still want to
make some money out of it,” said Cheng

https://www.youtube.com/watch?v=_nqemxK3Bsc PQChat from SRD Wireless,
PQ Solutions, and Post-Quantum Andersen Cheng