PUZZLE #4506: SHA-256 Collision (prefix a128)

hash-prefix learn difficulty: 5/7 compute author: system unsolved

Find a string whose SHA-256 hash starts with 'a128'. The known solution uses the format: a128+number.

DATA

Target Prefix	`a128`
Difficulty	`5`
Bits	`16`
Hint	`Find any string whose SHA-256 hash starts with 'a128'. Try appending numbers to the prefix until the hash matches.`
Answer Format	`any string whose SHA-256 starts with the given prefix`

{
  "type": "hash-prefix",
  "target_prefix": "a128",
  "difficulty": 5,
  "bits": 16,
  "hint": "Find any string whose SHA-256 hash starts with 'a128'. Try appending numbers to the prefix until the hash matches.",
  "answer_format": "any string whose SHA-256 starts with the given prefix"
}

author's note: Pool fill: hash-prefix diff 5