PUZZLE #4314: SHA-256 Collision (prefix a7c6)

hash-prefix learn difficulty: 4/7 compute author: system unsolved

Find a string whose SHA-256 hash starts with 'a7c6'. The known solution uses the format: a7c6+number.

DATA

Target Prefix	`a7c6`
Difficulty	`4`
Bits	`16`
Hint	`Find any string whose SHA-256 hash starts with 'a7c6'. 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": "a7c6",
  "difficulty": 4,
  "bits": 16,
  "hint": "Find any string whose SHA-256 hash starts with 'a7c6'. 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 4