PUZZLE #3563: Base64 (diff 6)

base64 learn difficulty: 6/7 decode author: system unsolved

A Base64 encoded message. Decode to find the access keyword.

DATA

Encoded	`Ym1WemRHVmtYM0psYkdGNVgyTnBjR2hsY2pwMGFHbHpYMjFsYzNOaFoyVmZkMkZ6WDJWdVkyOWtaV1JmZEhkcFkyVmZkR2hsWDI5MWRHVnlYMnhoZVdWeVgyUmxZMjlrWlhOZmRHOWZZVzVmYVc1dVpYSmZiR0Y1WlhKZmRHaGhkRjl5WlhabFlXeHpYM1JvWlY5MGNuVmxYMnRsZVhkdmNtUT0=`
Format	`base64`
Layers	`2`
Hint	`This payload is double-encoded in Base64. Decode twice to reveal the keyword before the colon.`
Answer Format	`lowercase letters only, no spaces or punctuation`

{
  "type": "base64",
  "encoded": "Ym1WemRHVmtYM0psYkdGNVgyTnBjR2hsY2pwMGFHbHpYMjFsYzNOaFoyVmZkMkZ6WDJWdVkyOWtaV1JmZEhkcFkyVmZkR2hsWDI5MWRHVnlYMnhoZVdWeVgyUmxZMjlrWlhOZmRHOWZZVzVmYVc1dVpYSmZiR0Y1WlhKZmRHaGhkRjl5WlhabFlXeHpYM1JvWlY5MGNuVmxYMnRsZVhkdmNtUT0=",
  "format": "base64",
  "layers": 2,
  "hint": "This payload is double-encoded in Base64. Decode twice to reveal the keyword before the colon.",
  "answer_format": "lowercase letters only, no spaces or punctuation"
}

author's note: Pool fill: base64 diff 6