The CBDE (Certified Blockchain Developer – Ethereum) exam is a Blockchain Training Alliance (BTA) certification with 70 multiple-choice questions, a 90-minute time limit and a 70% passing score. It is taken online through the BTA Student Portal, and the exam voucher costs $275 USD.
The CBDE exam is a performance-based test of Ethereum development skills. It checks that you can write, test and deploy secure Solidity smart contracts, work with Ethereum gas fees, and use the core tools of the Ethereum ecosystem.
TroyTec's CBDE practice exams include 102 questions and answers. You can practice in PDF or in the Online Test Engine before you launch your exam.
Vendor : Blockchain Training Alliance (BTA)
Exam code : CBDE
Certification : Certified Blockchain Developer – Ethereum
Number of questions : 70 multiple-choice
Time limit : 90 minutes
Passing score : 70%
Exam voucher : $275 USD
Language : English
Delivery : Online, launched from the BTA Student Portal
Results : Immediate, reported as PASS/FAIL with your percentage
BTA does not split the CBDE into numbered sections or publish weightings. Instead, it lists the tasks a candidate must prove they can do.
The exam proves you can:
Implement web3.js
Write and compile Solidity smart contracts
Create secure smart contracts
Deploy smart contracts to both live and test Ethereum networks
Calculate Ethereum gas costs
Unit test smart contracts
Run an Ethereum node on a development machine
Skills a CBDE holder demonstrates:
Planning and preparing production-ready applications for the Ethereum blockchain
Writing, testing and deploying secure Solidity smart contracts
Understanding and working with Ethereum fees
Working within the bounds and limitations of the Ethereum blockchain
Using the essential tools and systems of the Ethereum ecosystem
BTA designed the CBDE for software engineers, programmers, developers and application architects.
How the exam runs:
After you buy the voucher, the exam appears in your BTA Student Portal under the Exams tab.
You start it with the "Launch Exam" option, and you cannot exit once it begins.
You have 90 minutes for 70 multiple-choice questions.
Your PASS/FAIL result and percentage appear as soon as you finish. BTA does not report scores for individual questions.
The CBDE exam has 70 multiple-choice questions. You have 90 minutes to complete it.
The passing score is 70%. Results are reported as PASS or FAIL with your percentage, right after the exam.
The CBDE exam voucher costs $275 USD, or $499 USD with BTA's prep course. The voucher expires one year after purchase.
Yes. You launch the CBDE exam from the BTA Student Portal, and you cannot exit it once it begins.
The CBDE exam covers Solidity smart contracts, smart contract security, deployment to live and test Ethereum networks, gas cost calculation, unit testing, web3.js and running an Ethereum node.
The CBDE is designed for software engineers, programmers, developers and application architects.
Yes, but you need a new exam voucher, and you must wait at least 48 hours before retaking it.
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Everything you need to know about the BTA CBDE Exam: Certified Blockchain Developer – Ethereum Practice Tests certification
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Updated October 07, 2026
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