The post discusses advancements in DECO's zero-knowledge proof (ZKP) protocol to protect the privacy of sensitive data lengths in JSON responses. Traditional ZKP methods reveal the private input lengths, which can leak significant information. DECO's solution involves padding JSON scalars to mask their true lengths while retaining the ability to verify data integrity without revealing sensitive information. The process involves transforming the array of scalars into a padded form, represented as pairs of padded values and their actual lengths, enabling a secure reconstruction circuit that preserves privacy by shifting padding to the rightmost part of the string. The post also compares two concatenation sequences—Sequence A and Sequence B—highlighting Sequence B's efficiency due to its optimized cost structure, and introduces selective redaction to cater to different privacy needs. This development is part of a series of research efforts by Chainlink Labs, aiming to enhance DECO's approach to secure data handling.