Glossary

Plain-English definitions for every blockchain and MetaCoin term used on Bluescan. Use it as a reference while exploring the explorer, or as a starting point for understanding the MetaCoin protocol.

Foundations

Block: A batch of transactions confirmed together. Each block has a sequential height, a 64-character hash that uniquely identifies it, a timestamp, and a list of included transactions. Blocks form a chain because each one references the previous block hash.
Block height: The position of a block in the chain, starting from 0 (the genesis block). On Bluescan you can search by block height directly — paste the number into the search bar.
Block hash: A 64-character hexadecimal fingerprint of the block produced by hashing its header. Two explorers showing the same hash for the same height confirms they see the same chain.
Transaction (tx): A single state-change operation submitted to the network — a transfer, a token registration, an NFT mint, a sale. Each transaction has a 64-character hash and is included in exactly one block.
Transaction hash (tx hash): The unique 64-character identifier of a transaction. Use it to look up the operation across any explorer or chain client.
Address: A wallet identifier on the MetaCoin network. MetaCoin addresses start with "MT" followed by 38 alphanumeric characters (40 total). Addresses are public — anyone can look up a wallet on Bluescan and see its balances and history.
Wallet: Software that manages your private keys and lets you sign transactions. The wallet generates an address from your keys, and the address is what you share publicly.

MetaCoin

MetaCoin (MTC): The blockchain network and its native token. The MetaCoin network runs on Hyperledger Fabric, a permissioned blockchain framework, and uses MTC as the unit for fees and value transfer.
MRC-010: The fungible token standard on MetaCoin. Equivalent in role to ERC-20 on Ethereum. Each MRC-010 token has an integer ID, a name, a symbol, decimals, and an owner. New supply can be created via Increase events; existing supply can be destroyed via Burn events.
MRC-401: The single-issue NFT standard on MetaCoin. Each MRC-401 token exists as exactly one copy and is owned by exactly one address at any time. Used for unique digital art, certificates, and one-of-a-kind collectibles.
MRC-402: The multi-edition NFT standard on MetaCoin. A single registration can produce many copies of an asset, each held by different wallets. Holders can "melt" their copy to redeem the underlying value if the issuer specified an initial reserve.

Token operations

Token Create: The lifecycle event recorded when a new MRC-010 token is registered on the network. Includes the initial supply, name, symbol, owner, and any metadata supplied at registration.
Increase: A lifecycle event that mints additional supply of an existing MRC-010 token. The total supply on Bluescan reflects the sum of the initial supply plus all Increase events minus all Burn events.
Burn: A lifecycle event that destroys a portion of an MRC-010 token supply. Burned tokens are subtracted from the circulation supply and cannot be transferred or recovered.
Reserve: An initial allocation specified at token registration. Reserves are transferred to designated addresses as part of the token creation event, not as separate transfers.
Transfer: A standard movement of tokens from one wallet to another. Both the sender and receiver wallets show the operation in their transaction history.
Multi Transfer: A single transaction that transfers tokens from one sender to many receivers. Bluescan rolls up the recipients into one expandable row on the transaction list.

Locks & vesting

Lock balance: The portion of a wallet's holdings for a given token that is currently bound by an unlock timestamp. Locked balance cannot be transferred until the unlock date is reached.
Unlock date: The UNIX timestamp at which a locked balance becomes spendable. Bluescan shows the absolute date and the relative countdown ("in 3d 12h") for each lock.
Lock chunk: An individual locked portion within a single token holding. A wallet can hold multiple chunks for the same token, each with its own unlock date — for example, a vesting schedule that releases 10% per quarter.

NFT terms

Mint: Creating a new NFT. For MRC-401 it produces a single token; for MRC-402 it adds copies to an existing edition.
Melt: Destroying an MRC-402 NFT in exchange for its underlying initial reserve, if the issuer registered one. The NFT is removed from the holder's wallet and the reserve token is credited.
Auction: A timed sale where bidders compete for an NFT. The highest bid at the close of the auction wins, and the proceeds (minus the creator commission) go to the seller.
Creator commission: A percentage of every secondary-market sale that returns to the original creator. Specified at registration and enforced by the chain.

Explorer concepts

Pagination: Lists on Bluescan are split into pages of fixed size. The page number is part of the URL — for example /token/list/3 — so any page can be linked to or bookmarked directly.
Canonical URL: The "official" form of a URL for a given page. Bluescan emits a canonical link for every detail page so search engines do not treat /tokens (the redirect) and /token/list/1 (the destination) as duplicates.
Indexer: A background worker that walks the blockchain and writes a relational copy of the data into a database. Indexers are what make explorer-style queries possible — without one, every search would require scanning the chain from genesis.

API

API key: A secret string that identifies your account on paid API tiers. Keys are sent in the X-API-Key header or as a query parameter and are subject to per-key rate limits.
Rate limit: The maximum number of API requests allowed per minute, per IP (Free tier) or per key (paid tiers). Exceeding the limit returns HTTP 429 with a Retry-After header.
Sliding window: A rate-limiting strategy that counts requests over the previous 60 seconds rather than per fixed clock minute. Avoids the burst-at-the-edge problem of fixed windows.