Blockcerts vs Tahdah Digital Badges
Blockcerts
blockcerts.orgTahdah Digital Badges
tahdah.meSide by side
| Figure | Blockcerts | Tahdah Digital Badges |
|---|---|---|
| Price from | Free | £69/mo |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | Yes | — |
| Web | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 2 | 10 |
| Spec score · Credentialing Software | 9.0 (#2) | 7.1 (#29) |
| Purpose | Blockcerts is an open standard and open-source ecosystem for creating, issuing, viewing, and verifying blockchain-based credentials and official records. | Tahdah issues secure, shareable digital badges and certificates to prove learner achievement, qualifications, skills, or professional status. |
| Verification | The universal verifier checks records independently and can be built into existing software systems. | Badges include a secure verification link so employers, regulators, or other third parties can verify authenticity online. |
Plans
Tahdah Digital Badges
- Individual Badge — 250 badges£69 a month
- Individual Badge — 1,000 badges£129 a month
- Individual Seat — 1,000 seats£139 a month
- Individual Badge — 2,500 badges£249 a month
- Individual Seat — 2,500 seats£259 a month
- Individual Badge — 5,000 badges£399 a month
- Individual Seat — 5,000 seats£409 a month
- Individual Badge — 7,500 badges£499 a month
- Individual Badge — 10,000 badges£599 a month
- Individual Badge — 10,001+ badgesPriced on request
In their own words
Blockcerts
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.
Tahdah Digital Badges
Tahdah Digital Badges has no write-up on Specifiction yet; its figures are above.