Blockcerts vs POK

Blockcerts is an open standard and open-source ecosystem for creating, issuing, receiving, and checking blockchain-based credentials and official records. Its intended settings include civic records, education, professional licensing, and workforce development. Recipients can use the Blockcerts app to receive, import, keep, and share credentials; a private passphrase supports ownership and recovery. A universal verifier checks records independently and can be incorporated into other software. Developer resources include Python tools for creating and issuing credentials, a JavaScript verification library for Node.js or browsers, and a standalone web verifier. The issuer library supports Bitcoin and Ethereum, while the standard is designed to work across blockchains. Verification checks issuer signatures and certificate data, including expiry and revocation. Issued certificates cannot be edited, though an issuer can revoke an incorrect one or issue a replacement batch. Blockchain data is a one-way hash of certificate information. Blockcerts is free; Bitcoin batch issuance may incur a variable network transaction fee.

POK (Proof of Knowledge) helps organizations issue, manage, and verify digital credentials and microcredentials, including Open Badges 3.0 credentials on blockchain. Each credential has a unique link and QR code that opens a public page with the issuer, holder, date, skills, and current status. Its template editor supports logos, backgrounds, typefaces, signatures, custom attributes, dynamic API images, and paper formats. Organizations can issue credentials in bulk from Excel or CSV files; the free plan has no user cap or added bulk-issuance cost. Connections include Moodle, Canvas, Blackboard, D2L Brightspace, and Open edX through LTI 1.3, Sana through xAPI, and other systems through LTI, API keys, REST API, or webhooks. LMS rules can issue credentials after course completion, optionally with a minimum grade. POK supports several credential standards and offers white-label branding. Its Free Web2 plan is free; blockchain verification is $0.30, paid once, or $3,000 a year for up to 50,000 credentials.