On-Chain Raffle Verifier

Fetch children from ordinals.com (API / HTML), filter by draw block, reproduce draws (quoted blockhash), and check a ticket.

About this verifier

This tool deterministically reproduces raffle draws from a public Bitcoin block hash and a list of ticket inscriptions (children) present at the draw height. Anyone with the block hash and the ticket ordering can verify winners without trusting an oracle.

Formula

winner_i = sha256(concat) % children_B

where concat = "hex(blockhash_B)" + str(i)

hex(blockhash_B): lowercase hex, no 0x, quoted (includes the literal double-quote characters)
str(i): decimal draw index (base-10), appended after the quoted hash
sha256: SHA-256 of the UTF-8 bytes of the concatenated string; interpret the result as a big-endian hex integer
Modulo: take the integer mod children_B (number of tickets present at block B)
Note: duplicate wins are allowed by design

Raffle parent

Note: the verifier prefers ordinals.com JSON endpoints but falls back to HTML scraping; if the API fails (CORS/rate limits), you can paste block hash or load tickets manually.

Parent inscription ID

Draw block height (B)

Block hash at B (hex)

# of draws

Start draw index

Auto-fill reads metadata → raffle → draw → block and counts winners (share entries).

Check your ticket Ticket inscription ID

Winners