References
- Bitcoin: A Peer-to-Peer Electronic Cash System (opens in a new tab)
- Trillian (opens in a new tab)
- transparency-dev (opens in a new tab)
- Arweave (opens in a new tab)
- Surety (opens in a new tab)
- OpenTimestamps (opens in a new tab)
- How to time-stamp a digital document, Haber & Stornetta 1991 (opens in a new tab)