A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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places to trade ether with other currencies or assets
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The process used by mutually untrusting users to agree on the validation and execution of transactions and smart contracts.
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a network allows computers to communicate and exchange data
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Relating to ERC-721, the standard for Non-Fungible Tokens (also known as Deeds)
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For questions regarding the installation or use of EthereumJ, a Java library that implements the Ethereum protocol.
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a digital asset and a payment system invented by satoshi nakamoto.
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The "TheDAO" refers to the Slock.it DAO, the first major DAO (decentralized autonomous organization) on Ethereum.
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light or thin clients do not store the whole blockchain and are used on mobile, embedded or IoT devices
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a security-deposit based economic consensus protocol.
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Discipline or techniques employed in protecting integrity or secrecy of electronic messages by converting them into unreadable (cipher text) form.
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Questions related to the Go programming language
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an algorithm that transfers data input of any size into a fixed size data which acts as a kind of "signature" for the data provided.
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Questions dealing with the contracts or clients logs. The tag "events" may be more appropriate, see https://ethereum.stackexchange.com/questions/tagged/events
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a way for miners to pool their resources together and share their hashing power while splitting the reward equally according to the amount of shares they contributed to solving a bloc…
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For questions regarding contracts compilation.
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make smart contract functions able to receive either, or to make Ether transfers to address variables possible.
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Questions related to the transactions fees and gas costs in Ethereum
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Questions dealing with the ethminer client.
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tag used for any topics on unspecific ethereum clients which allow interaction with the blockchain and smart contracts.
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Questions related to the genesis block or file used in the initialization of a blockchain.
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incentivised, censorship-resistant decentralised storage
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Questions related to memory use in Solidity or by nodes
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Questions related to other nodes in the Ethereum network, such as finding, connecting, and disconnecting from them.
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a general-purpose computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible.