COMIT Hiring Challenge:

We are inviting talented blockchain developers who are interested to join us on the development of COMIT Network to take on our hiring challenge.

To qualify for the role, complete one of the three challenges (Ethereum/Bitcoin/Cryptography) below and send us your results.

Current openings: 1 opening

About TenX

TenX is driven by a talented team of developers, marketing experts, designers, lawyers, cryptography and security specialists.

TenX even has bankers and accountants on their team ready to create the foundation for exponential growth within the virtual currency space.

The TenX Research Lab is looking to hire a candidate with strong grasps of the principles of blockchain technologies, cryptography, distributed systems and peer-to-peer networks. Past experience in research related project is a plus but more importantly that people are are hungry and self-driven, interested in the blockchain ecosystem and willing to grow and learn.

Location: Remote or Sydney, Australia (visa required)

Job Duties

Together with a team of research scientists and research engineers, carry out innovative, impactful research of strategic importance to TenX that will lead to novel and important scientific outcomes
Development of PoC's (Proof of Concepts) and MVP's (Minimum Viable Products)
Design and implement infrastructure components on top or within blockchains
Work on security critical peer-to-peer cryptocurrency protocols
Building efficient, readable and well-tested code

THE CHALLENGE

A) For Ethereum developers:

Part 1 - Write a HTLC in EVM assembly in less than 35 opcodes:

Input:
<preimage>: the secret for the hardcoded hash

Output:
send entire amount contained in the contract to hardcoded recipient

Requirements:

Hardcoded recipient
Hardcoded expiry & recipient 2
Send all ether via SELFDESTRUCT in both cases (Timelock expiry and correct preimage)

Part 2 - Write a simple 2-2 multi-sig in EVM assembly in less than 30 opcodes:

Input:
<sig1> <sig2>

Output:
withdraw all eth contained in the contract

Submit the OPCODES & Deployable code for Part 1 & 2 below.

2) For Bitcoin developers:

Write a bitcoin HTLC transaction and redeem it.

Input for redemption:
<preimage>: the secret for the hardcoded hash
<signature>: to redeem the output

Output:
Spend into a standard P2PKH

Requirements:

The solution should consist out of 2 transactions:

The locking transaction, i.e., spending into the HTLC from a standard P2PKH
The spending transaction, i.e., spending from the HTLC into a standard P2PKH

use Sha256 for the preimage locking
redeem HTLC by providing the correct preimage
the contract should include a signature check, i.e., in case of the redemption through preimage, a different signature should be required than spending through the time-lock

Submit the transaction hashes below.

3) For cryptographers:

Sign a message using a 2 party DSA signature.

Requirements:

Single DSA public key
2 parties can efficiently generate the combined signature
but neither of the 2 parties can sign alone

Submit the two keys and both the partially and fully signed transactions below.

Upon submission, our team will review your submission and contact you if the submission fulfils the requirements.

TenX PTE LTD