{"id":1000153,"date":"2026-06-17T08:06:41","date_gmt":"2026-06-17T08:06:41","guid":{"rendered":"https:\/\/dev.themarketperiodical.com\/glossary\/proof-of-work\/"},"modified":"2026-06-17T08:06:41","modified_gmt":"2026-06-17T08:06:41","slug":"proof-of-work","status":"publish","type":"glossary","link":"https:\/\/themarketperiodical.com\/de\/glossary\/proof-of-work\/","title":{"rendered":"Proof of Work"},"content":{"rendered":"<p><strong>Proof of Work (PoW)<\/strong> was introduced by Bitcoin in 2009 and remains its consensus mechanism today. The core idea is that producing a valid block requires a demonstrable expenditure of real-world computational effort, making it economically costly to attack or rewrite the ledger.<\/p>\n<p>To add a block, a miner must find a <strong>nonce<\/strong> \u2014 a number \u2014 that, when combined with the block&#8217;s data and hashed through a cryptographic function (SHA-256 for Bitcoin), produces an output below a certain target value. Finding this nonce requires brute-force trial and error; there is no shortcut. The difficulty of finding a valid nonce is adjusted periodically so that blocks are produced at roughly the target rate.<\/p>\n<p>Key properties of Proof of Work:<\/p>\n<ul>\n<li><strong>Security through cost:<\/strong> An attacker who wants to alter the blockchain would need to redo the work for the target block and all subsequent blocks faster than honest miners are adding new blocks \u2014 a task that becomes prohibitively expensive on large networks.<\/li>\n<li><strong>51% attack risk:<\/strong> If a single entity controls more than half of the network&#8217;s total mining power, they could potentially rewrite recent blocks. On large PoW networks, acquiring this share of hardware is extremely expensive.<\/li>\n<li><strong>Energy intensity:<\/strong> PoW&#8217;s security guarantee is directly tied to physical resource expenditure, which means it requires significant electricity.<\/li>\n<\/ul>\n<p>Proof of Work is sometimes contrasted with <strong>Proof of Stake<\/strong>, which replaces computational effort with economic collateral. Ethereum transitioned from PoW to PoS in 2022; Bitcoin continues to use PoW by design and consensus among its community.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Proof of Work (PoW) was introduced by Bitcoin in 2009 and remains its consensus mechanism today. The core idea is that producing a valid block requires a demonstrable expenditure of real-world computational effort, making it economically costly to attack or rewrite the ledger. To add a block, a miner must find a nonce \u2014 a \u2026<\/p>\n","protected":false},"template":"","meta":[],"class_list":["post-1000153","glossary","type-glossary","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/themarketperiodical.com\/de\/wp-json\/wp\/v2\/glossary\/1000153","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/themarketperiodical.com\/de\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/themarketperiodical.com\/de\/wp-json\/wp\/v2\/types\/glossary"}],"wp:attachment":[{"href":"https:\/\/themarketperiodical.com\/de\/wp-json\/wp\/v2\/media?parent=1000153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}