https://news.bitcoin.com/learning-cryptography-bitcoin-proof-existence/
Learning Cryptography Through Bitcoin's Proof of Existence Feature
Feb 28, 2017 - Bitcoin is not only a great alternative currency and settlement system but also has a vast array of untapped use cases waiting to be discovered. Since the
proof of existencelearningcryptographybitcoinfeature
https://yolandarenee.blogspot.com/2023/04/proof-of-existence-by-j-lenni-dorner.html
DEFENDING THE PEN: PROOF OF EXISTENCE by J LENNI DORNER
A blog about writing, flash fiction, marketing, publishing, and books
defending the penproof of existenceby jlennidorner