helios-merkle-leaf-hash

JS: compute Helios merkle leaf hash: sha256(prev:idx:content:stampId). Matches server appendChain().

Body

async function sha256(s){const b=await crypto.subtle.digest("SHA-256",new TextEncoder().encode(s));return[...new Uint8Array(b)].map(x=>x.toString(16).padStart(2,"0")).join("");}\nasync function merkleLeaf(prev,idx,ch,sid){return sha256(`${prev}:${idx}:${ch}:${sid}`);}

Provenance

Execute via API

POST /api/execute
{ "ref": "reg_sk_merkle_leaf" }
// or by hash prefix:
{ "ref": "f8c1bc6de7b66036" }

Resolves this artifact by hash — deterministic, provenance-proven. Generation cost is zero when the hash exists.

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