Bitcoin Developer Guide – Mining.In:Bitcoin Developer Guide.The Bitcoin Foundation,abgerufen am 22.September 2014(englisch):„Mining adds new blocks to the block chain, making transaction history hard to modify.“
Bitcoin Developer Guide – Block Chain Overview.In:Bitcoin Developer Guide.The Bitcoin Foundation,abgerufen am 10.November 2016(englisch):„A block of one or more new transactions is collected into the transaction data part of a block. Copies of each transaction are hashed, and the hashes are then paired, hashed, paired again, and hashed again until a single hash remains, the merkle root of a merkle tree. The merkle root is stored in the block header. Each block also stores the hash of the previous block’s header, chaining the blocks together. This ensures a transaction cannot be modified without modifying the block that records it and all following blocks.“
Bitcoin Developer Guide – Block Chain Overview.In:Bitcoin Developer Guide.The Bitcoin Foundation,abgerufen am 22.Februar 2023(englisch):„The block chain is collaboratively maintained by anonymous peers on the network, so Bitcoin requires that each block prove a significant amount of work was invested in its creation to ensure that untrustworthy peers who want to modify past blocks have to work harder than honest peers who only want to add new blocks to the block chain. Chaining blocks together makes it impossible to modify transactions included in any block without modifying all subsequent blocks. As a result, the cost to modify a particular block increases with every new block added to the block chain, magnifying the effect of the proof of work. The proof of work used in Bitcoin takes advantage of the apparently random nature of cryptographic hashes. A good cryptographic hash algorithm converts arbitrary data into a seemingly random number. If the data is modified in any way and the hash re-run, a new seemingly random number is produced, so there is no way to modify the data to make the hash number predictable.“
Fabio Bergamin:Sicherheitslücke in Blockchain-Plattform entdeckt.In:News & Veranstaltungen.ETH Zürich,21.Januar 2019,abgerufen am 22.Februar 2023:„Chainsecurity wurde vor einem Jahr von ETH-Professor Martin Vechev und den ehemaligen ETH-Doktoranden Ritzdorf und Petar Tsankov gegründet. Die Firma verfolgt generell das Ziel, Blockchain-Technologien sicherer zu machen. Dazu entwickelt und betreibt Chainsecurity automatisierte Scan-Programme für smarte Verträge. Anbieter solcher smarten Verträge können sich von der Firma auditieren und somit die Sicherheit ihrer Verträge garantieren lassen. Chainsecurity ist also quasi ein TÜV für smarte Verträge.“
IT supplement on blockchain: A brief history of blockchain. In: Chartech magazine. Nr.210, 2017 (Online[abgerufen am 27.September 2017] 5 Referenz auf Beilage, Artikel auf S. 4 der Beilage).
Certainly, there is a growing sense that blockchain is a poorly understood (and somewhat clunky) solution in search of a problem.Blockchain’s Occam problem.In:mckinsey.com.Januar 2019,abgerufen am 28.Januar 2019(englisch).
Eine Lösung, der das Problem fehlt. “The global financial industry has not yet been able to do much with the technology known as blockchain. […] The project was shelved because banks and other potential users believed the same results could be achieved more cheaply using current technology. […] Basically, it became a solution in search of a problem.”Wall Street rethinks blockchain projects as euphoria meets reality.27.März 2018,abgerufen am 28.Januar 2019(englisch).
Blockchain. (Memento vom 1. Juni 2016 im Internet Archive) In: Jens Fromm, Mike Weber (Hrsg.): ÖFIT-Trendschau: Öffentliche Informationstechnologie in der digitalisierten Gesellschaft. Kompetenzzentrum Öffentliche IT, Berlin 2016, ISBN 978-3-9816025-2-4.
