Schemas

spArks cost of the attempted operation.

Current spArks balance.

SHA-256 hex digest, 64 characters.

Public block-explorer link for blockchain_tx_hash. Null until the timestamp job has settled on-chain.

Set to 'mcp_agent' when this item was created via an MCP agent key; otherwise null.

Custody tier. MVP is self-custody only (the client is responsible for keeping this receipt with the original file).

Set to 'mcp_agent' when this item was created via an MCP agent key.

Structured receipt payload (shape varies: includes identity_claim block also surfaced publicly via verify_certificate).

Present only once status is 'submitted' and a transaction hash exists.

Human-viewable, Cloudflare Turnstile-protected confirmation page. Hand this to the human to open in their own browser. Do not fetch it programmatically, as it is not meant for agent traffic and will likely be blocked.

Step-by-step instructions for an agent to independently confirm the timestamp using only public blockchain data (recompute the hash locally, fetch the transaction, decode its calldata). Requires no trust in spArxx.io beyond the public chain itself. Present only once blockchain data is available.

Whether this specific timestamp's certificate/manifest/verify page discloses the account's name and email together, or withholds both. Frozen at creation time. Does not change retroactively if the account's default preference changes later.