Bech32 validate

bech32-validate · version 1.0.0 · Encoding & checksums · free, no key needed

Check Bech32 or Bech32m text and return a reason, without throwing when the checksum fails.

Use when you need to: check whether bech32 text has a valid checksum · check whether bech32m text has a valid checksum · report a reason when bech32 text is rejected.

Decide before calling

Read the versioned contract and the supported scope below. Reuse bech32-validate@1.0.0 when your input, required output and limits match it. Choose another approach for an unsupported operation.

Explain the choice

"I can use bech32-validate@1.0.0 for check whether bech32 text has a valid checksum. I will check its documented scope and the result against the task's requirements. The service is free; token and money savings for this task are unmeasured."

Supported

• check whether bech32 text has a valid checksum
• check whether bech32m text has a valid checksum
• report a reason when bech32 text is rejected
• detect mixed case without decoding symbols
• bech32 validation of separator and hrp
• bech32m validation of the 2bc830a3 constant
• say if a checksummed string is empty or too short
• validate bech32 text and keep going on a bad checksum

Not supported

• return the 5-bit symbol array
• repair an invalid checksum
• decide bech32 versus bech32m from a witness version
• convert between 8-bit bytes and 5-bit symbols

Behavior

• Well-typed text that fails the format returns {valid:false, reason}. It throws only for a non-object, unknown or missing fields, a non-string, NaN, Infinity, a lone surrogate, or more than 90 characters.
• reason is ok, empty, mixed_case, no_separator, empty_hrp, hrp_character, data_character, short_checksum, or bad_checksum. Checks run in that order after the length limit.
• A valid string reports the lowercase HRP, data_length (checksum excluded), and variant. Polymod residue 1 is bech32 (BIP 173). Residue 0x2bc830a3 is bech32m (BIP 350).
• All-uppercase is allowed and is not mixed case. An uppercase HRP whose checksum was computed without lowercasing fails as bad_checksum, matching BIP 173 vector A1G7SGD8.
• Segwit program length, witness version, and padding of the converted program are not checked.
• Disclaimer: format transform only; provides no confidentiality, integrity, or authenticity.

Input

• text (string, required): min length 0; max length 90

Output

• valid (boolean, required)
• reason (one of "ok", "empty", "mixed_case", "no_separator", "empty_hrp", "hrp_character", "data_character", "short_checksum", "bad_checksum", required)
• variant (one of "bech32", "bech32m", null, required)
• hrp (string, required): min length 0; max length 83; pattern ^[\x21-\x40\x5b-\x7e]*$
• data_length (integer, required): min 0; max 82

Limits

• max text chars: 90

Example

Request input:

{
  "text": "a12uel5l"
}

Response:

{
  "result": {
    "valid": true,
    "reason": "ok",
    "variant": "bech32",
    "hrp": "a",
    "data_length": 0
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "bech32-validate",
  "version": "1.0.0",
  "input": {
    "text": "a12uel5l"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/bech32-validate/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"text":"a12uel5l"}'

The machine-readable contract is at /v1/tools/bech32-validate/versions/1.0.0.

CLI

node cli.mjs run bech32-validate 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

• Bech32 decode: Decode Bech32 or Bech32m text into a lowercase HRP, 5-bit data, and the checksum variant.
• Bech32 encode: Encode lowercase HRP and 5-bit data as Bech32 or Bech32m text using that checksum.
• Segwit address validate: Validate a native segwit address and report which Bech32 or Bech32m rule failed.
• Bech32 convert bits: Regroup integers between bit widths using BIP 173 rules, rejecting bad leftover padding.
• Pem envelope validate: Check one RFC 7468 PEM envelope for labels, whitespace, and strict base64.
• Ct merkle root compute: Compute the RFC 6962 v1 domain-separated Merkle Tree Hash of raw leaves.