{"id":567727,"date":"2026-10-01T08:30:48","date_gmt":"2026-10-01T07:30:48","guid":{"rendered":"https:\/\/cryptoslate.com\/?p=567727"},"modified":"2026-09-30T21:35:35","modified_gmt":"2026-09-30T20:35:35","slug":"bases-cobalt-upgrade-adds-another-rule-to-affect-token-balances","status":"publish","type":"post","link":"https:\/\/cryptoslate.com\/bases-cobalt-upgrade-adds-another-rule-to-affect-token-balances\/","title":{"rendered":"Base\u2019s Cobalt upgrade adds another rule to affect token balances"},"content":{"rendered":"<p>Base\u2019s Cobalt upgrade, scheduled for mainnet Sept. 30 at 18:00 UTC, will let issuers of B20 tokens configure balance seizures separately from ordinary transfer restrictions. For a token that enables the feature, a holder could remain free to transfer while still being eligible for administrative reassignment.<\/p>\n<p>B20 is <a href=\"https:\/\/docs.base.org\/upgrades\/beryl\/b20\">Base\u2019s native ERC-20-compatible token standard<\/a>, offered in Asset and Stablecoin variants. It already gives administrators control over roles and policies governing balance movements, and now it will also govern the administrative powers over those balances.<\/p>\n<p>Role assignments identify who can exercise a particular power, while policy settings determine which accounts an operation can affect. Changing a token\u2019s rules and executing a balance operation involve distinct permission checks.<\/p>\n<h2>Separate seizure permissions<\/h2>\n<p>The <a href=\"https:\/\/docs.base.org\/base-chain\/specs\/reference\/b20\/changelog\/02-cobalt-b20-seize\">new administrative operation<\/a>, called <code>seizeWithMemo<\/code>, moves a specified amount from a holder to another address. It preserves total supply and skips ordinary transfer policies and holder allowances.<\/p>\n<p>An issuer must configure which accounts lose their exemption before the function can take their tokens. The setting, <code>SEIZE_EXEMPT_POLICY<\/code>, exempts everyone when left unset. Configuring eligibility alone is insufficient: execution requires <code>SEIZE_ROLE<\/code>, an unpaused seizure function, a permitted recipient, and sufficient balance.<\/p>\n<figure id=\"attachment_567737\" aria-describedby=\"caption-attachment-567737\" style=\"width: 720px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-818c6136-e9b6-413c-86e6-9a43085c41e2.png\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"shoggoth-infographic shoggoth-infographic-portrait wp-image-567737\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-818c6136-e9b6-413c-86e6-9a43085c41e2.png\" alt=\"Comparison of Base's B20 ordinary transfers, optional administrative seizure and blocked-account burning: separate permissions, default seizure exemption, and different effects on token supply.\" width=\"720\" height=\"900\" srcset=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-818c6136-e9b6-413c-86e6-9a43085c41e2.png 1122w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-818c6136-e9b6-413c-86e6-9a43085c41e2-240x300.png 240w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-818c6136-e9b6-413c-86e6-9a43085c41e2-819x1024.png 819w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-818c6136-e9b6-413c-86e6-9a43085c41e2-768x960.png 768w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/a><figcaption id=\"caption-attachment-567737\" class=\"wp-caption-text\">B20 issuers can separately allow transfers, enable administrative seizure or burn blocked balances, with seizure disabled by default.<\/figcaption><\/figure>\n<p>A separate recipient policy determines where the seized tokens can go, and leaving that policy unset allows any otherwise valid destination. The holder\u2019s ability to make an ordinary transfer does not answer either seizure-policy question.<\/p>\n\n<div class=\"cs-article-embed\">\n    <a href=\"https:\/\/cryptoslate.com\/trump-backed-4-billion-usd1-stablecoin-has-wallet-powers-its-own-github-does-not-show\/\" class=\"cs-article-embed__link\">\n        <div class=\"cs-article-embed__body\">\n            <span class=\"cs-article-embed__related-reading\">Related Reading<\/span>\n            <h3 class=\"cs-article-embed__title\">Trump-backed $4 billion USD1 stablecoin has wallet powers its own GitHub does not show<\/h3>\n        <\/div>\n        <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\">\n            <i class=\"fa-light fa-arrow-up-right\"><\/i>\n        <\/span>\n    <\/a>\n<\/div>\n\n<p>B20\u2019s existing <a href=\"https:\/\/docs.base.org\/upgrades\/beryl\/b20\">transfer policies<\/a> check the sender and receiver, plus the executor for certain transfers on another account\u2019s behalf. Administrators can update those policies. Approving a spender does not remove the checks on the eventual transfer, but those ordinary transfer permissions are distinct from Cobalt\u2019s seizure rules.<\/p>\n<p>B20 also already has <code>burnBlocked<\/code>, which lets an authorized caller <a href=\"https:\/\/docs.base.org\/upgrades\/beryl\/b20\">destroy tokens held by an account denied by the transfer sender policy<\/a>. Cobalt marks that function deprecated but keeps it callable with its existing behavior.<\/p>\n<p>That leaves issuers with different ways to remove a holder\u2019s balance. Reassignment keeps the tokens in circulation at another address, while destroying the seized supply requires a subsequent burn. Seizure and burning have separate administrative roles and pause controls.<\/p>\n<p><a href=\"https:\/\/status.base.org\/\">Base\u2019s status page<\/a> lists the mainnet upgrade as scheduled, with maintenance from 18:00 to 20:00 UTC. The <a href=\"https:\/\/docs.base.org\/upgrades\/cobalt\/overview\">upgrade overview<\/a> lists Sepolia as live since Sept. 23 and mainnet as shipping on Sept. 30.<\/p>\n<p>The <a href=\"https:\/\/github.com\/base\/base\/releases\/tag\/v1.4.2\">v1.4.2 release<\/a> adds Cobalt mainnet support and instructs node operators to upgrade by Sept. 30 at 18:00 UTC.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scheduled for September 30 at 18:00 UTC, Cobalt would let B20 issuers opt into seizure policies independent of ordinary transfer restrictions.<\/p>\n","protected":false},"author":1264,"featured_media":567750,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77968,79325,77497,37],"tags":[75695],"post_folder":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.9 (Yoast SEO v21.9.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Base\u2019s Cobalt 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