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A key aspect of privacy in blockchains is the use of private and public keys. Blockchain systems use asymmetric cryptography to secure transactions between users. [7] In these systems, each user has a public and private key. [7] These keys are random strings of numbers and are cryptographically related. [7]
Zcash is a privacy-focused cryptocurrency which is based on Bitcoin's codebase. [4] It shares many similarities, such as a fixed total supply of 21 million units. [5] Transactions can be transparent, similar to bitcoin transactions, or they can be shielded transactions which use a type of zero-knowledge proof to provide anonymity in ...
Blockchain.info was established by Ben Reeves in 2011. He launched a website which could be used to track bitcoin transactions. [8] The website was a block explorer, a website that allowed bitcoin users to see the details of public cryptocurrency transactions if they have the identifying hash code for the transaction. [9]
Keybase is a key directory that maps social media identities to encryption keys (including, but not limited to PGP keys) in a publicly auditable manner. [2] Additionally it offers an end-to-end encrypted chat and cloud storage system, [3] [4] called Keybase Chat and the Keybase Filesystem respectively.
Attribute-based encryption is a generalisation of public-key encryption which enables fine grained access control of encrypted data using authorisation policies.The secret key of a user and the ciphertext are dependent upon attributes (e.g. their email address, the country in which they live, or the kind of subscription they have).
With the advent of blockchain technology, a new model for decentralized identity emerged in 2015. [8] The FIDO Alliance proposed an identity model that was no longer account-based, but identified people through direct, private, peer-to-peer connections secured by public/private key cryptography. Self-Sovereign Identity (SSI) summarises all ...
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In valid blockchain transactions, only unspent outputs (UTXOs) are permissible for funding subsequent transactions. This requirement is critical to prevent double-spending and fraud. Accordingly, inputs in a transaction are removed from the UTXO set, while outputs create new UTXOs that are added to the set.