# Glossary

**Blockchain**

It is a form of distributed database (or ledger) that acts as a record of all the valid transactions which are transmitted to the blockchain network.

#### Contract

An on-chain document representing the contract between token issuer and user.

#### Issue

Mint a token from an on-chain contract transaction.

#### P2PKH (Pay to public key hash)

The most common locking script used by default to send bitcoin.

#### Redeem

Destroy the token and return the locked Satoshis to the issuer.

#### Satoshis

The smallest indivisible unit of a bitcoin. 1E8 Satoshis = 1 bitcoin.

#### Script

Low level bitcoin script.

#### SDK

Software Developer Kit is a software library to make certain tasks easier for a software developer.

#### STAS

A token script named after its creator Stas. Also a reverse acronym: Substantiated Tokens from Actualized Satoshis.

#### Token

It is a type of digital property or control element that can be transferred using a blockchain.

#### UTXO

An Unspent Transaction Output is an amount of bitcoin that can be spent by the recipient.