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Bitcoin HASH256 (Double SHA-256)
x402
Bitcoin HASH256 (Double SHA-256) is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Computes Bitcoin's HASH256 function — SHA-256 applied twice — on a hex-encoded byte string or plain text input
Price / call$0.001
Success—
StatusUnknown
How this service works
Bitcoin HASH256 — SHA-256 applied twice — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object with ok:true, the type field set to 'hash-double-sha256', the resulting digest (SHA-256 applied twice to the input), a timestamp, and a payment receipt including transaction hash, amount in USD, and a receipt ID.
Example use cases
Verify Bitcoin transaction hash
“I have a raw Bitcoin transaction in hex — 0x0100000001... — can you run HASH256 on it so I can verify the transaction ID myself?”
Bitcoin script opcode testing
“I'm testing OP_HASH256 behavior in a Bitcoin script. Can you double-SHA256 this hex payload 0xdeadbeefcafebabe and give me the result?”
Hash arbitrary text Bitcoin-style
“Hash the text 'genesis block' using Bitcoin's double SHA-256 algorithm so I can see what the raw HASH256 digest looks like.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/hash-double-sha256?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need Bitcoin-standard double SHA-256 hashing (HASH256) as used in Bitcoin transaction ID computation, block hashing, and script opcodes. Prefer it over generic SHA-256 services when you specifically need the Bitcoin double-hash primitive, and when you want a paid, auditable receipt of the computation via the x402 micropayment protocol.
Side effects
- Invalid hex string (not matching ^0x[0-9a-fA-F]* pattern) returns an error response
- Text input exceeding 49152 characters is rejected
- Missing both hex and text parameters results in a bad request error
- Payment failure via x402 protocol prevents execution
- Network timeout on the UnyKorn endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "hash-double-sha256",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.001,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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