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### Global State |
The set of public properties included in the [state](#contract-state) of a [contract](#contract), defined in [Genesis](#genesis) and optionally updatable according to the rule defined therein, which are not [owned](#ownership) by any party. |
[Link](https://docs.rgb.info/rgb-state-and-operations/components-of-a-contract-operation#global-state) |
### Lightning Network |
A decentralized network of bidirectional payment (state) channels constituted by 2-of-2 mutisig wallet constructing and updating off-chain transactions. It represents a popular Bitcoin Layer 2 scaling solution. |
[Link](https://lightning.network/) |
### Multi Protocol Commitment - MPC |
The Merkle Tree structure used in RGB to include in a single Bitcoin Blockchain commitment the multiple [Transition Bundles](#transition-bundle) of different contracts. |
[Link](https://github.com/rgb-protocol/RGB-Documentation/blob/master/annexes/commitment-layer/multi-protocol-commitments-mpc.md) |
### Owned State |
Part of the [state](#contract-state) of a [contract](#contract) enclosed into an [Assignment](#assignment) that contains the definition of the digital property being subjected to someone's [ownership](#ownership). |
[Link](https://docs.rgb.info/rgb-state-and-operations/components-of-a-contract-operation#owned-states) |
### Ownership |
The control and thus the possibility to spend a [UTXO](#utxo) to which some client-side property isthat [assigned](#assignment). |
### Partially Signed Bitcoin Transaction - PSBT |
A transaction which lacks some element of its signature and which can be completed/finalized with some additional elements later in time. |
[Link](https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki) |
### Schema |
A declarative piece of code that contains the set of variables, rules, and [business logic](#business-logic) according to which an RGB contract works. |
[Link](https://docs.rgb.info/rgb-contract-implementation/schema) |
### Seal Definition |
The reference part of an [Assignment](#assignment) which binds the commitment to a [UTXO](#utxo) belonging to the new [owner](#ownership). |
[Link](https://docs.rgb.info/rgb-state-and-operations/components-of-a-contract-operation#seal-definition) |
### Shard |
A branch of the [DAG](#directed-acyclic-graph---dag) chain of the RGB [State Transitions](#state-transition). |
### Single-Use Seal |
A promise to [commit](#commitment) to a yet unknown message in the future, once and only once, such that commitment fact will be provably known to all members of a certain audience. |
[Link](https://docs.rgb.info/distributed-computing-concepts/single-use-seals) |
### Stash |
The set of client-side data related to one or more [contracts](#contract) that undergo [validation](#client-side-validation) and are stored by the users. |
### State Transition |
The most important [contract operation](#contract-operation) that makes possible the transition of an RGB State to a New State, changing [state](#contract-state) data and/or ownership. |
[Link](https://docs.rgb.info/rgb-state-and-operations/state-transitions#state-transitions-and-their-mechanics) |
### Strict Type System |
An infrastructure that allows to create complex types which are deterministically identified by their `semId`. It is used by schemas to precisely define the data type for their state. |
[Link](https://docs.rgb.info/rgb-library-map#strict-types). |
### Taproot |
The Bitcoin's Segwit v1 transaction format detailed in [BIP341](https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki) and [BIP342](https://github.com/bitcoin/bips/blob/master/bip-0342.mediawiki). |
### Transition Bundle |
A set of RGB [State Transitions](#state-transition) that belong to the same contract and that are committed in the same [witness transaction](#witness-transaction). |
[Link](https://docs.rgb.info/rgb-state-and-operations/state-transitions#transition-bundle) |
### UTXO |
A Bitcoin Unspent Transaction Output. It is defined by a transaction hash and a *vout* index which, collectively, constitute an [outpoint](https://en.bitcoin.it/wiki/Protocol_documentation#tx). |
### Witness Transaction |
The transaction that provides the [Seal](#single-use-seal) closing operation around a message that contains a [Multi Protocol Commitment](#multi-protocol-commitment-mpc) an [MPC](#multi-protocol-commitment-mpc) Tree. |
*** |
# Contract Transfers |
In this section we will be guided through a step-by-step RGB Contract Transfer operation, again with the cooperation of our cryptographic couple: Alice and Bob. We will also provide some coding sections of both our characters, which use the `rgb` Command Line Interface Tool which can be installed from the dedicated [RG... |
Let's start with Bob, who owns a Bitcoin wallet but has not yet started using RGB technology. |
**1)** To begin operating with RGB protocol, **Bob must install an RGB wallet**. This startup process involves installing the RGB wallet software, which usually, by default, contains no contracts. The RGB wallet software, in addition, requires the ability to interact with Bitcoin UTXO through a Bitcoin wallet and a Bit... |
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