Akashi Notari
Proof of existence for files: anchor a SHA-256 hash on Base, look up proofs. Paid with x402.
Should I use this
Quality & Safety
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"akashi-notari": {
"url": "https://anchor.akashi-notari.com/mcp"
}
}
}Remote endpoints
https://anchor.akashi-notari.com/mcpstreamable-httpWhat it can do
Tool inventory
Tools (2)
🟢find_proof(hash, tx)
Free. Look up whether a file hash is anchored on Base and when, or read the proof written by a transaction. Pass `hash` or `tx`. Call it before anchor_hash to avoid paying for a hash that is already anchored.
Input Schema
{
"type": "object",
"properties": {
"hash": {
"type": "string",
"pattern": "^(0x)?[0-9a-fA-F]{64}$",
"description": "SHA-256 of the file, 64 hex characters"
},
"tx": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{64}$",
"description": "Transaction hash; use instead of hash"
}
}
}🟡anchor_hash(hash, filename)
Paid with x402 (USDC on Base). Writes the SHA-256 hash of a file on-chain; the block time becomes the proof of existence. Compute the hash locally and never send the file. The hash, the filename and the payer address become public and permanent. Without a payment in _meta["x402/payment"] the result is the payment requirement.
Input Schema
{
"type": "object",
"properties": {
"hash": {
"type": "string",
"pattern": "^(0x)?[0-9a-fA-F]{64}$",
"description": "SHA-256 of the file, 64 hex characters"
},
"filename": {
"type": "string",
"maxLength": 128,
"description": "Optional name to record with the hash: a-z 0-9 - _ ."
}
},
"required": [
"hash"
]
}Community
Evidence