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Mastering Bitcoin

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Mastering Bitcoin ( mastering-bitcoin )

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they don’t win the game because they don’t achieve the game target (less than four). The pool players will achieve the easier pool target much more often, earning them shares very regularly, even when they don’t achieve the harder target of winning the game. Every now and then, one of the pool players will throw a combined dice throw of less than four and the pool wins. Then, the earnings can be distributed to the pool players based on the shares they earned. Even though the target of eight-or-less wasn’t winning, it was a fair way to measure dice throws for the players and occasionally produces a less- than-four throw. Similarly, a mining pool will set a pool difficulty that will ensure that an individual pool miner can find block header hashes that are less than the pool difficulty quite often, earning shares. Every now and then, one of these attempts will produce a block header hash that is less than the bitcoin network target, making it a valid block and the whole pool wins. Managed Pools Most mining pools are “managed”, meaning that there is a company or individual run‐ ning a pool server. The owner of the pool server is called the pool operator and they charge pool miners a percentage fee of the earnings. The pool server runs specialized software and a pool-mining protocol that coordinates the activities of the pool miners. The pool server is also connected to one or more full bitcoin nodes and has direct access to a full copy of the blockchain database. This allows the pool server to validate blocks and transactions on behalf of the pool miners, relieving them of the burden of running a full node. For pool miners, this is an important con‐ sideration, as a full node requires a dedicated computer with at least 15-20 gigabytes of persistent storage (disk) and at least 2 gigabytes of memory (RAM). Furthermore, the bitcoin software running on the full node needs to be monitored, maintained and up‐ graded frequently. Any downtime caused by a lack of maintenance or lack of resources will impact the miner’s profitability. For many miners the ability to mine without run‐ ning a full node is another big benefit of joining a managed pool. Pool miners connect to the pool server using a mining protocol such as Stratum (STM) or GetBlockTemplate (GBT). An older standard called GetWork (GWK) is now mostly obsolete since late 2012, as it does not easily support mining at hash rates above 4 GH/ s. Both the STM and GBT protocols create block templates that contain a template of a candidate block header. The pool server constructs a candidate block by aggregating transactions, adding a coinbase transaction (with extra nonce space), calculating the merkle root and linking to the previous block hash. The header of the candidate block is then sent to each of the pool miners as a template. Each pool miner then mines using the block template, at a lower difficulty than the bitcoin network difficulty and sends any successful results back to the pool server to earn shares. Mining and the Hashing Race | 213

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