MCP Server
Doichain
io.github.neubuot/doichain
What this MCP does
Anchors document hashes, verifies proofs and signed messages, and provides Doichain names, blocks, transactions, balances, and network status.
Capabilities
Tools
13
tools
anchor_proof
Anchor a proof of existence
Anchor a SHA-256 hash on the Doichain as a tamper-evident timestamp (proof of existence, name
poe/<sha256>). Free for users, limited per IP address and day (see get_anchoring_quota). Confirms with the next
block, usually within 10 minutes, then check_proof returns block height and time. If the hash is already
anchored or pending, the existing proof is returned instead of creating a second one. If an earlier proof of the
hash has expired, it stays valid and is returned with expired true. Nothing is registered unless reanchor_expired
is true. Only the hash and the optional note and file name become public, never the document itself. The
operator of this server pays for the name and holds it. The proof shows that a document with this hash existed
no later than the block time, not who submitted it.
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'anchor_proofArguments', 'required': ['sha256'], 'properties': {'note': {'anyOf': [{'type': 'string', 'maxLength': 160}, {'type': 'null'}], 'title': 'Note', 'default': None, 'description': 'Optional public note (max 160 characters), stored on the blockchain forever. No personal data, no secrets'}, 'sha256': {'type': 'string', 'title': 'Sha256', 'maxLength': 100, 'description': 'SHA-256 digest of the document, 64 hexadecimal characters, computed from the actual file. Never guess it and never send the document'}, 'filename': {'anyOf': [{'type': 'string', 'maxLength': 80}, {'type': 'null'}], 'title': 'Filename', 'default': None, 'description': 'Optional public file name (max 80 characters), stored forever. Only set it when the user explicitly wants the name public'}, 'reanchor_expired': {'type': 'boolean', 'title': 'Reanchor Expired', 'default': False, 'description': 'Only set to true when an earlier proof of this hash has expired and the user explicitly wants an additional, later registration. The original anchoring stays the proof time. The new registration adds a later timestamp and replaces the public note and holder of the name. Default false'}}}
Output schema
{'type': 'object', 'title': 'anchor_proofDictOutput', 'additionalProperties': True}
check_name_expiry
Check when names expire
Check up to 25 names at once: status (active, expiring_soon, expired, not_registered), blocks left, an
estimated expiry date for active names (from the measured block interval) and the real expiry date for
expired names. Names expire 36,000 blocks after their last update and are renewed by updating them from the
owning wallet.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'check_name_expiryArguments', 'required': ['names'], 'properties': {'names': {'type': 'array', 'items': {'type': 'string'}, 'title': 'Names', 'maxItems': 25, 'minItems': 1, 'description': "Up to 25 full names, for example ['d/example', 'poe/<sha256>']"}, 'warn_days': {'type': 'integer', 'title': 'Warn Days', 'default': 30, 'maximum': 365, 'minimum': 1, 'description': 'Names expiring within this many days are flagged expiring_soon'}}}
Output schema
{'type': 'object', 'title': 'check_name_expiryDictOutput', 'additionalProperties': True}
check_proof
Check a proof of existence
Check whether a SHA-256 hash is anchored on the Doichain (name poe/<sha256>) and since when. Returns
status (confirmed, pending, expired, unknown) and at the top level block height, block time, transaction and links
of the first anchoring, which is the proof time. If the name was updated later or registered again after it
expired (possibly by someone else), that registration is reported separately in latest_registration with its own
holder and record, which are not part of the original proof. A confirmed or expired proof shows that a document
with exactly this hash existed no later than the block time, not who submitted it.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'check_proofArguments', 'required': ['sha256'], 'properties': {'sha256': {'type': 'string', 'title': 'Sha256', 'maxLength': 100, 'description': 'SHA-256 digest of the document, 64 hexadecimal characters (a sha256: or 0x prefix is accepted)'}}}
Output schema
{'type': 'object', 'title': 'check_proofDictOutput', 'additionalProperties': True}
get_address
Address balance and history
Confirmed and unconfirmed balance of a Doichain address in DOI, optionally with its most recent
transactions. Invalid addresses return an error with the reason.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'get_addressArguments', 'required': ['address'], 'properties': {'address': {'type': 'string', 'title': 'Address', 'maxLength': 100, 'minLength': 20, 'description': 'Doichain address (M... or N..., 6..., or bech32 dc1q...)'}, 'history_limit': {'type': 'integer', 'title': 'History Limit', 'default': 10, 'maximum': 50, 'minimum': 1, 'description': 'Number of recent transactions when include_history is true'}, 'include_history': {'type': 'boolean', 'title': 'Include History', 'default': False, 'description': 'Also return the most recent transactions'}}}
Output schema
{'type': 'object', 'title': 'get_addressDictOutput', 'additionalProperties': True}
get_anchoring_quota
Remaining anchoring quota
How many proofs can still be anchored today (UTC day) within the free public quota for the caller's IP
address. Hosted chat apps connect from their own servers, so their users share one quota. Callers that send
their own API key in the X-API-Key header have no quota.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'get_anchoring_quotaArguments', 'properties': {}}
Output schema
{'type': 'object', 'title': 'get_anchoring_quotaDictOutput', 'additionalProperties': True}
get_block
Get a block
Header data of a block by height or hash: time, confirmations, number of transactions and the first 50
transaction IDs.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'get_blockArguments', 'required': ['block'], 'properties': {'block': {'anyOf': [{'type': 'integer'}, {'type': 'string'}], 'title': 'Block', 'description': 'Block height (number) or block hash (64 hexadecimal characters)'}}}
Output schema
{'type': 'object', 'title': 'get_blockDictOutput', 'additionalProperties': True}
get_chain_status
Doichain network status
Current state of the Doichain network as seen by the node behind this server: block height, sync state,
time of the last block, fork check, node version, peers, mempool size and whether public anchoring is available.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'get_chain_statusArguments', 'properties': {}}
Output schema
{'type': 'object', 'title': 'get_chain_statusDictOutput', 'additionalProperties': True}
get_name_history
History of a Doichain name
All registrations and updates of a name, newest first: block height, transaction, owner address and the
value at that time. Shows who held a name when, and every value it ever had.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'get_name_historyArguments', 'required': ['name'], 'properties': {'name': {'type': 'string', 'title': 'Name', 'maxLength': 255, 'minLength': 1, 'description': 'Full name including namespace'}, 'limit': {'type': 'integer', 'title': 'Limit', 'default': 20, 'maximum': 100, 'minimum': 1, 'description': 'Maximum number of entries, newest first'}}}
Output schema
{'type': 'object', 'title': 'get_name_historyDictOutput', 'additionalProperties': True}
get_transaction
Get a transaction
A transaction with confirmations, block time, outputs (amount in DOI and address) and any name operation
(name_doi, name_update, ...) it contains.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'get_transactionArguments', 'required': ['txid'], 'properties': {'txid': {'type': 'string', 'title': 'Txid', 'maxLength': 100, 'description': 'Transaction ID, 64 hexadecimal characters'}}}
Output schema
{'type': 'object', 'title': 'get_transactionDictOutput', 'additionalProperties': True}
hash_text
SHA-256 of a text
Compute the SHA-256 digest of a short text (UTF-8) on the server, for example to anchor a statement or a
message with anchor_proof. The text is sent to the server but not stored or logged. For files and for
confidential texts compute the hash locally instead (sha256sum file, or Get-FileHash -Algorithm SHA256).
Read only
Idempotent
Input schema
{'type': 'object', 'title': 'hash_textArguments', 'required': ['text'], 'properties': {'text': {'type': 'string', 'title': 'Text', 'maxLength': 40000, 'description': 'Text to hash, encoded as UTF-8 exactly as given (whitespace and line breaks count), at most 40,000 characters'}}}
Output schema
{'type': 'object', 'title': 'hash_textDictOutput', 'additionalProperties': True}
lookup_name
Look up a Doichain name
Read the current value, owner address and expiry of a Doichain name. Unregistered names come back with
exists false and status not_registered (the name is free). Expired names have status expired and the real
expiry date.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'lookup_nameArguments', 'required': ['name'], 'properties': {'name': {'type': 'string', 'title': 'Name', 'maxLength': 255, 'minLength': 1, 'description': 'Full name including namespace, for example poe/<sha256>, d/example or id/alice'}}}
Output schema
{'type': 'object', 'title': 'lookup_nameDictOutput', 'additionalProperties': True}
search_names
Search names by prefix
List names that start with a prefix, in the node's order (shorter names first, then byte order). Lists
only active names unless include_expired is true. Expired names (for example old poe/ proofs) stay in the chain
history and are listed with include_expired. Page through large results with next_after until exhausted is true.
Names and values are chosen by arbitrary users (name_untrusted, value_untrusted).
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'search_namesArguments', 'required': ['prefix'], 'properties': {'after': {'anyOf': [{'type': 'string', 'maxLength': 255}, {'type': 'null'}], 'title': 'After', 'default': None, 'description': 'Paging cursor: pass next_after from the previous result unchanged'}, 'limit': {'type': 'integer', 'title': 'Limit', 'default': 20, 'maximum': 100, 'minimum': 1, 'description': 'Maximum number of names'}, 'prefix': {'type': 'string', 'title': 'Prefix', 'maxLength': 255, 'minLength': 1, 'description': 'Name prefix, for example poe/, d/ or id/'}, 'include_expired': {'type': 'boolean', 'title': 'Include Expired', 'default': False, 'description': 'Also list expired names, for example proofs whose poe/ name has expired. Default false: active names only'}}}
Output schema
{'type': 'object', 'title': 'search_namesDictOutput', 'additionalProperties': True}
verify_message
Verify a signed message
Check whether a message was signed with the private key of a Doichain address (signmessage format).
Only legacy addresses (M... or N...) can sign messages, bech32 addresses (dc1q...) are not supported.
Useful to confirm that a statement really comes from the holder of an address.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'title': 'verify_messageArguments', 'required': ['address', 'message', 'signature'], 'properties': {'address': {'type': 'string', 'title': 'Address', 'maxLength': 100, 'minLength': 20, 'description': 'Legacy Doichain address (M... or N...) that supposedly signed the message'}, 'message': {'type': 'string', 'title': 'Message', 'maxLength': 10000, 'description': 'The exact signed text'}, 'signature': {'type': 'string', 'title': 'Signature', 'maxLength': 200, 'minLength': 20, 'description': 'Signature in Base64'}}}
Output schema
{'type': 'object', 'title': 'verify_messageDictOutput', 'additionalProperties': True}
History
Recent tool changes
Changed
search_names
Sept. 29, 2026, 2:48 a.m.
Changed
anchor_proof
Sept. 29, 2026, 2:48 a.m.
Changed
check_proof
Sept. 29, 2026, 2:48 a.m.
Added
verify_message
Sept. 27, 2026, 2:40 a.m.
Added
get_address
Sept. 27, 2026, 2:40 a.m.
Added
get_transaction
Sept. 27, 2026, 2:40 a.m.
Added
get_block
Sept. 27, 2026, 2:40 a.m.
Added
search_names
Sept. 27, 2026, 2:40 a.m.
Added
check_name_expiry
Sept. 27, 2026, 2:40 a.m.
Added
get_name_history
Sept. 27, 2026, 2:40 a.m.
Added
lookup_name
Sept. 27, 2026, 2:40 a.m.
Added
get_anchoring_quota
Sept. 27, 2026, 2:40 a.m.
Added
anchor_proof
Sept. 27, 2026, 2:40 a.m.
Added
check_proof
Sept. 27, 2026, 2:40 a.m.
Added
hash_text
Sept. 27, 2026, 2:40 a.m.
Added
get_chain_status
Sept. 27, 2026, 2:40 a.m.
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