## Concept - Blockchain vs [[cryptocurrency]]? - Blockchain is the _technology_ that _enabled_ cryptocurrency. - Blockchain vs [[db]]? - Limited support to - High transaction volume. 30 transactions per second for [[ethereum|Ethereum]], while [[visa|Visa]] supports up to 25k. - Search and indexing - No support to - Data deletion/updating - [[distributed|Distributed]] essence - [[hash|Hash Function]] - Fast - Deterministic - Non-reversible - Avalanche effect - Low collision ## Implementations - [[bitcoin|Bitcoin]] - developed for financial transactions - [[ethereum|Ethereum]] - evolved to a "global distributed computer" - Solana - "Ethereum killer" - Permissioned blockchains - Hyperledger Fabric - IBM, The Linux Foundation - Corda R3 - Initial focus on business