Network
Launch Date
Consensus
Note
Sepolia
Oct 2021
PoW
Like-for-like representation of Ethereum
Görli
Jan 2019
PoA
Proof-of-Authority
Kiln
Mar 2022
PoS
Post-Merge (for ETH2), shadow fork of the mainnet
Kintsugi
Dec 2021
PoS
DEPRECATED, use Kiln; post-Merge (for ETH2)
Ropsten
Nov 2016
PoW
DEPRECATED, use Sepolia; the Merge to happen on Jun 8, 2022
Rinkeby
Apr 2017
PoA
DEPRECATED, use Görli and Görli Faucet
Kovan
Mar 2017
PoA
DEPRECATED, use Sepolia or Görli
List of active and deprecated Ethereum testnets, including Kintsugi.
Features
Optimistic rollup 
ZK-rollup 
Proof
Uses fraud proofs to prove transaction validity. 
Uses validity (zero-knowledge) proofs to prove transaction validity. 
Capital efficiency
Requires waiting through a 1-week delay (dispute period) before withdrawing funds. 
Users can withdraw funds immediately because validity proofs provide incontrovertible evidence of the authenticity of off-chain transactions. 
Data compression
Publishes full transaction data as calldata to Ethereum Mainnet, which increases rollup costs. 
Doesn't need to publish transaction data on Ethereum because ZK-SNARKs and ZK-STARKs already guarantee the accuracy of the rollup state. 
EVM compatibility
Uses a simulation of the Ethereum Virtual Machine (EVM), which allows it to run arbitrary logic and support smart contracts. 
Doesn't widely support EVM computation, although a few EVM-compatible ZK-rollups have appeared. 
Rollup costs
Reduces costs since it publishes minimal data on Ethereum and doesn't have to post proofs for transactions, except in special circumstances. 
Faces higher overhead from costs involved in generating and verifying proofs for every transaction block. ZK proofs require specialized, expensive hardware to create and have high on-chain verification costs. 
Trust assumptions
Doesn't require a trusted setup. 
Requires a trusted setup to work. 
Liveness requirements
Verifiers are needed to keep tabs on the actual rollup state and the one referenced in the state root to detect fraud. 
Users don't need someone to watch the L2 chain to detect fraud. 
Security properties 
Relies on cryptoeconomic incentives to assure users of rollup security. 
Relies on cryptographic guarantees for security. 
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curl 
https://release.solana.com/v1.10.32/solana-install-init-x86_64-pc-windows-msvc.exe 
--output 
C:\solana-install-tmp\solana-install-init.exe 
--create-dirs
Solana
SOLANA SFT OVERVIEW

What are semi-fungible tokens (SFTs)?

Learn What SFTs Are, How They Work, and What Makes Them Different from NFTs and SPL Tokens
Last Updated:
January 26, 2023
Table of Contents
Table of Contents
Table of Contents

{{get-started-solana}}

Semi-fungible tokens (SFTs) combine the characteristics of fungible tokens (FTs) and non-fungible tokens (NFTs), and are a comparatively recent innovation for the Solana blockchain. SFTs are currently being used in gaming and metaverse applications, and are expected to have many other uses in the future.

The idea of semi-fungible tokens were initially created on Ethereum with the ERC1155 multi-token standard, and now exist on Solana as SFTs. To grasp how SFTs function on Solana it’s necessary to understand the blockchain’s architecture, which divides logic and data into Data Accounts and Program Accounts, as well as Solana's Token Metadata program.

How are SFTs different from fungible and non-fungible tokens?

Semi-fungible tokens exhibit the qualities of fungible tokens and non-fungible tokens at different points in their lifecycle. Initially, SFTs function like fungible tokens and can be exchanged with identical tokens with no loss of value for either party. Once used, they lose their exchange value and gain the attributes of collectible non-fungible tokens.

What are the main advantages of using SFTs instead of NFTs?

SFTs are preferable to NFTs in certain contexts as they are more efficient, cost-effective, flexible, and involve improved transaction security.

1. Reversible Transactions

Perhaps the most significant advantage of using SFTs over NFTs is that token transactions to incorrect addresses are reversible and refundable.

2. More Efficient and Cost-effective

Unlike NFTs which must be transferred individually, SFTs support batch transfers. This means that multiple SFTs can be transferred in a single program call, saving time and significantly reducing transaction costs.

3. Improved Security

SFTs permit highly secure transfers by improving upon the existing standards for NFTs.

What are SFTs used for?

Currently, SFTs are primarily used in gaming and metaverse environments where on-chain activity can be attached to in-game assets. Let's look at two examples: managing many units of the same NFT, and recording gaming achievements.

1. Genopets SFT Example

Genopets is an NFT game on the Solana blockchain that utilizes both NFTs and SFTs. Players can buy a unique pet as an NFT, and the abundant resources they gather (e.g. wood, water, crystals, metal etc.) are available as SFTs.

SFTs are preferable for NFT gaming because they allow players to buy and sell multiple assets (e.g. 15 water crystals) in a single transaction. Fungible tokens can accommodate multiple assets in a single program (i.e. smart contract), meaning their transfer generates less congestion and lower transaction fees than standard NFTs, which are handled individually.

2. In-game Achievements Example

SFTs are also useful for recording game history. For example, an in-game weapon can be made as an SFT, and as the weapon is used it gains the characteristics of an NFT to become a new unique item because of it's recorded in-game history.

As the item changes hands over time, new history can be stored (e.g. how many times the weapon has been used, how many times it had been used to kill other players, etc.) like traditional weapon characteristics in web2 video games.

How do SFTs work on Solana?

SFTs on Solana operate as a unique type of account to which metadata is attached to a token to represent characteristics in a game or metaverse environment. 

The functioning of SFTs on Solana is related to the blockchain’s unique architecture, specifically, the division of logic and data into two distinct components called programs and data accounts, and the Token Metadata program.

What are programs and accounts on Solana?

Unlike most blockchains, Solana divides logic and data into two distinct components called programs and accounts. Rather than storing data in variables like Solidity smart contracts, programs in Solana can interact with, and have the ability to mutate, external data stored in data accounts.

This unique structure makes programs in Solana highly performant by allowing programs to run in parallel while accessing several accounts. The separation between executable cope and data accounts makes the programs in Solana more modular, as they are not inherently bound to any individual data.

Solana accounts are arrays of bytes stored at a particular address. The address of an account can be defined as the public key of a cryptographic pair. To sign into an account, a program must also have access to the key pair’s private key. Some types of programs have the ability to mutate data in that account.

Newly created accounts are usually initialized by a program marked as the owner of the account. The program defines the structure of data allocated to the account and is also responsible for providing instructions to the account.

The types of accounts on Solana include:‍

  1. Mint Accounts - store the global information of a token
  2. Token Accounts - store the relationship between a user’s Wallet Account and a Mint Account.

Source: Metaplex Documentation

How are Program Derived Addresses (PDAs) different from other accounts on Solana?

PDAs are account addresses that are algorithmically derived from the public key of the program that owns the account they’re home to, rather than forming part of a cryptographic pair.

Accounts located at PDAs are designed to be controlled by the specific program their address is generated from. Because Program Derived Addresses are algorithmically generated from a program’s public key, it’s impossible for two different programs to generate the PDA.

PDAs have some important uses, such as allowing programs to sign Cross-Program Invocations and enabling the creation of multiple accounts within an address that can be derived deterministically.

What is the Token Metadata program on Solana?

The purpose of the Token Metadata program on Solana is to allow the addition of extra metadata to tokens because Mint Accounts are limited in the amount and types of data they can store. 

The Token Metadata program is part of the Metaplex protocol, which was initially developed to simplify the creation of NFTs on Solana. However, the program also works with SFTs.

A Mint Account stores only a few data attributes about a token, such as its current supply and authorities. Mint Accounts can’t hold other data that apps and marketplaces use. To overcome this limitation, the Token Metadata program offers a Metadata Account located at a PDA derived from the address of the Mint Account. The Metadata Account incorporates many valuable attributes, allowing regular on-chain tokens to be made into digital assets.

Source: Metaplex Documentation

What is the JSON standard?

The JSON standard is a way to add data to tokens that is stored off-chain, in order to save on the fees involved in storing additional data on-chain. The URI attribute in Metadata Accounts links to an off-chain JSON file which stores useful information on tokens following a certain standard.

To ensure the JSON file cannot be updated, it can be stored using a permanent storage solution such as Arweave. Additionally, the Is Mutable attribute in the Metadata Account can be used to prevent the URI attribute, and other attributes, from being changed.

Source: Metaplex Documentation

What is the relevance of the Token Metadata program to SFTs on Solana?

Token metadata is the way that SFTs on Solana become functional in games or metaverse environments as metadata-heavy objects, such as weapons.

A Semi-fungible Token in Solana consists of a Mint Account with two properties:

  1. It has a supply greater than or equal to 0, (e.g. more than 1 token is in circulation)
  2. It has no decimal places (e.g. whole integers only)

The addition of the Metadata Account keeps track of the fungibility of a token through its Token Standard attribute. The program automatically assigns this attribute, which cannot be updated manually. Additionally, The FungibleAsset attribute represents the token standard for SFTs. 

Source: Metaplex Documentation

The Metadata Account also contains other important information that specifies the SFT as a particular in-game weapon, for example. This information includes the animation or logo which, under the JSON standard, can be stored off-chain using the URI attribute.

Example SFT metadata fields and their descriptions.
JSON example of Solana SFT metadata.

What are the implications of SFTs for the future of web3?

The hybrid nature of SFTs has opened up new possibilities for how tokens can be used to represent complex digital assets in a variety of environments in a cost-effective, highly functional manner.

Although gaming and metaverse use cases are the most popular uses for SFTs, they’re attracting a lot of attention because of their enhanced flexibility and the opportunity to reduce costs by storing data off-chain.

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Solana
SOLANA SFT OVERVIEW

What are semi-fungible tokens (SFTs)?

Learn What SFTs Are, How They Work, and What Makes Them Different from NFTs and SPL Tokens
Last Updated:
January 26, 2023
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Table of Contents
Table of Contents

{{get-started-solana}}

Semi-fungible tokens (SFTs) combine the characteristics of fungible tokens (FTs) and non-fungible tokens (NFTs), and are a comparatively recent innovation for the Solana blockchain. SFTs are currently being used in gaming and metaverse applications, and are expected to have many other uses in the future.

The idea of semi-fungible tokens were initially created on Ethereum with the ERC1155 multi-token standard, and now exist on Solana as SFTs. To grasp how SFTs function on Solana it’s necessary to understand the blockchain’s architecture, which divides logic and data into Data Accounts and Program Accounts, as well as Solana's Token Metadata program.

How are SFTs different from fungible and non-fungible tokens?

Semi-fungible tokens exhibit the qualities of fungible tokens and non-fungible tokens at different points in their lifecycle. Initially, SFTs function like fungible tokens and can be exchanged with identical tokens with no loss of value for either party. Once used, they lose their exchange value and gain the attributes of collectible non-fungible tokens.

What are the main advantages of using SFTs instead of NFTs?

SFTs are preferable to NFTs in certain contexts as they are more efficient, cost-effective, flexible, and involve improved transaction security.

1. Reversible Transactions

Perhaps the most significant advantage of using SFTs over NFTs is that token transactions to incorrect addresses are reversible and refundable.

2. More Efficient and Cost-effective

Unlike NFTs which must be transferred individually, SFTs support batch transfers. This means that multiple SFTs can be transferred in a single program call, saving time and significantly reducing transaction costs.

3. Improved Security

SFTs permit highly secure transfers by improving upon the existing standards for NFTs.

What are SFTs used for?

Currently, SFTs are primarily used in gaming and metaverse environments where on-chain activity can be attached to in-game assets. Let's look at two examples: managing many units of the same NFT, and recording gaming achievements.

1. Genopets SFT Example

Genopets is an NFT game on the Solana blockchain that utilizes both NFTs and SFTs. Players can buy a unique pet as an NFT, and the abundant resources they gather (e.g. wood, water, crystals, metal etc.) are available as SFTs.

SFTs are preferable for NFT gaming because they allow players to buy and sell multiple assets (e.g. 15 water crystals) in a single transaction. Fungible tokens can accommodate multiple assets in a single program (i.e. smart contract), meaning their transfer generates less congestion and lower transaction fees than standard NFTs, which are handled individually.

2. In-game Achievements Example

SFTs are also useful for recording game history. For example, an in-game weapon can be made as an SFT, and as the weapon is used it gains the characteristics of an NFT to become a new unique item because of it's recorded in-game history.

As the item changes hands over time, new history can be stored (e.g. how many times the weapon has been used, how many times it had been used to kill other players, etc.) like traditional weapon characteristics in web2 video games.

How do SFTs work on Solana?

SFTs on Solana operate as a unique type of account to which metadata is attached to a token to represent characteristics in a game or metaverse environment. 

The functioning of SFTs on Solana is related to the blockchain’s unique architecture, specifically, the division of logic and data into two distinct components called programs and data accounts, and the Token Metadata program.

What are programs and accounts on Solana?

Unlike most blockchains, Solana divides logic and data into two distinct components called programs and accounts. Rather than storing data in variables like Solidity smart contracts, programs in Solana can interact with, and have the ability to mutate, external data stored in data accounts.

This unique structure makes programs in Solana highly performant by allowing programs to run in parallel while accessing several accounts. The separation between executable cope and data accounts makes the programs in Solana more modular, as they are not inherently bound to any individual data.

Solana accounts are arrays of bytes stored at a particular address. The address of an account can be defined as the public key of a cryptographic pair. To sign into an account, a program must also have access to the key pair’s private key. Some types of programs have the ability to mutate data in that account.

Newly created accounts are usually initialized by a program marked as the owner of the account. The program defines the structure of data allocated to the account and is also responsible for providing instructions to the account.

The types of accounts on Solana include:‍

  1. Mint Accounts - store the global information of a token
  2. Token Accounts - store the relationship between a user’s Wallet Account and a Mint Account.

Source: Metaplex Documentation

How are Program Derived Addresses (PDAs) different from other accounts on Solana?

PDAs are account addresses that are algorithmically derived from the public key of the program that owns the account they’re home to, rather than forming part of a cryptographic pair.

Accounts located at PDAs are designed to be controlled by the specific program their address is generated from. Because Program Derived Addresses are algorithmically generated from a program’s public key, it’s impossible for two different programs to generate the PDA.

PDAs have some important uses, such as allowing programs to sign Cross-Program Invocations and enabling the creation of multiple accounts within an address that can be derived deterministically.

What is the Token Metadata program on Solana?

The purpose of the Token Metadata program on Solana is to allow the addition of extra metadata to tokens because Mint Accounts are limited in the amount and types of data they can store. 

The Token Metadata program is part of the Metaplex protocol, which was initially developed to simplify the creation of NFTs on Solana. However, the program also works with SFTs.

A Mint Account stores only a few data attributes about a token, such as its current supply and authorities. Mint Accounts can’t hold other data that apps and marketplaces use. To overcome this limitation, the Token Metadata program offers a Metadata Account located at a PDA derived from the address of the Mint Account. The Metadata Account incorporates many valuable attributes, allowing regular on-chain tokens to be made into digital assets.

Source: Metaplex Documentation

What is the JSON standard?

The JSON standard is a way to add data to tokens that is stored off-chain, in order to save on the fees involved in storing additional data on-chain. The URI attribute in Metadata Accounts links to an off-chain JSON file which stores useful information on tokens following a certain standard.

To ensure the JSON file cannot be updated, it can be stored using a permanent storage solution such as Arweave. Additionally, the Is Mutable attribute in the Metadata Account can be used to prevent the URI attribute, and other attributes, from being changed.

Source: Metaplex Documentation

What is the relevance of the Token Metadata program to SFTs on Solana?

Token metadata is the way that SFTs on Solana become functional in games or metaverse environments as metadata-heavy objects, such as weapons.

A Semi-fungible Token in Solana consists of a Mint Account with two properties:

  1. It has a supply greater than or equal to 0, (e.g. more than 1 token is in circulation)
  2. It has no decimal places (e.g. whole integers only)

The addition of the Metadata Account keeps track of the fungibility of a token through its Token Standard attribute. The program automatically assigns this attribute, which cannot be updated manually. Additionally, The FungibleAsset attribute represents the token standard for SFTs. 

Source: Metaplex Documentation

The Metadata Account also contains other important information that specifies the SFT as a particular in-game weapon, for example. This information includes the animation or logo which, under the JSON standard, can be stored off-chain using the URI attribute.

Example SFT metadata fields and their descriptions.
JSON example of Solana SFT metadata.

What are the implications of SFTs for the future of web3?

The hybrid nature of SFTs has opened up new possibilities for how tokens can be used to represent complex digital assets in a variety of environments in a cost-effective, highly functional manner.

Although gaming and metaverse use cases are the most popular uses for SFTs, they’re attracting a lot of attention because of their enhanced flexibility and the opportunity to reduce costs by storing data off-chain.

Semi-fungible tokens (SFTs) combine the characteristics of fungible tokens (FTs) and non-fungible tokens (NFTs), and are a comparatively recent innovation for the Solana blockchain. SFTs are currently being used in gaming and metaverse applications, and are expected to have many other uses in the future.

The idea of semi-fungible tokens were initially created on Ethereum with the ERC1155 multi-token standard, and now exist on Solana as SFTs. To grasp how SFTs function on Solana it’s necessary to understand the blockchain’s architecture, which divides logic and data into Data Accounts and Program Accounts, as well as Solana's Token Metadata program.

How are SFTs different from fungible and non-fungible tokens?

Semi-fungible tokens exhibit the qualities of fungible tokens and non-fungible tokens at different points in their lifecycle. Initially, SFTs function like fungible tokens and can be exchanged with identical tokens with no loss of value for either party. Once used, they lose their exchange value and gain the attributes of collectible non-fungible tokens.

What are the main advantages of using SFTs instead of NFTs?

SFTs are preferable to NFTs in certain contexts as they are more efficient, cost-effective, flexible, and involve improved transaction security.

1. Reversible Transactions

Perhaps the most significant advantage of using SFTs over NFTs is that token transactions to incorrect addresses are reversible and refundable.

2. More Efficient and Cost-effective

Unlike NFTs which must be transferred individually, SFTs support batch transfers. This means that multiple SFTs can be transferred in a single program call, saving time and significantly reducing transaction costs.

3. Improved Security

SFTs permit highly secure transfers by improving upon the existing standards for NFTs.

What are SFTs used for?

Currently, SFTs are primarily used in gaming and metaverse environments where on-chain activity can be attached to in-game assets. Let's look at two examples: managing many units of the same NFT, and recording gaming achievements.

1. Genopets SFT Example

Genopets is an NFT game on the Solana blockchain that utilizes both NFTs and SFTs. Players can buy a unique pet as an NFT, and the abundant resources they gather (e.g. wood, water, crystals, metal etc.) are available as SFTs.

SFTs are preferable for NFT gaming because they allow players to buy and sell multiple assets (e.g. 15 water crystals) in a single transaction. Fungible tokens can accommodate multiple assets in a single program (i.e. smart contract), meaning their transfer generates less congestion and lower transaction fees than standard NFTs, which are handled individually.

2. In-game Achievements Example

SFTs are also useful for recording game history. For example, an in-game weapon can be made as an SFT, and as the weapon is used it gains the characteristics of an NFT to become a new unique item because of it's recorded in-game history.

As the item changes hands over time, new history can be stored (e.g. how many times the weapon has been used, how many times it had been used to kill other players, etc.) like traditional weapon characteristics in web2 video games.

How do SFTs work on Solana?

SFTs on Solana operate as a unique type of account to which metadata is attached to a token to represent characteristics in a game or metaverse environment. 

The functioning of SFTs on Solana is related to the blockchain’s unique architecture, specifically, the division of logic and data into two distinct components called programs and data accounts, and the Token Metadata program.

What are programs and accounts on Solana?

Unlike most blockchains, Solana divides logic and data into two distinct components called programs and accounts. Rather than storing data in variables like Solidity smart contracts, programs in Solana can interact with, and have the ability to mutate, external data stored in data accounts.

This unique structure makes programs in Solana highly performant by allowing programs to run in parallel while accessing several accounts. The separation between executable cope and data accounts makes the programs in Solana more modular, as they are not inherently bound to any individual data.

Solana accounts are arrays of bytes stored at a particular address. The address of an account can be defined as the public key of a cryptographic pair. To sign into an account, a program must also have access to the key pair’s private key. Some types of programs have the ability to mutate data in that account.

Newly created accounts are usually initialized by a program marked as the owner of the account. The program defines the structure of data allocated to the account and is also responsible for providing instructions to the account.

The types of accounts on Solana include:‍

  1. Mint Accounts - store the global information of a token
  2. Token Accounts - store the relationship between a user’s Wallet Account and a Mint Account.

Source: Metaplex Documentation

How are Program Derived Addresses (PDAs) different from other accounts on Solana?

PDAs are account addresses that are algorithmically derived from the public key of the program that owns the account they’re home to, rather than forming part of a cryptographic pair.

Accounts located at PDAs are designed to be controlled by the specific program their address is generated from. Because Program Derived Addresses are algorithmically generated from a program’s public key, it’s impossible for two different programs to generate the PDA.

PDAs have some important uses, such as allowing programs to sign Cross-Program Invocations and enabling the creation of multiple accounts within an address that can be derived deterministically.

What is the Token Metadata program on Solana?

The purpose of the Token Metadata program on Solana is to allow the addition of extra metadata to tokens because Mint Accounts are limited in the amount and types of data they can store. 

The Token Metadata program is part of the Metaplex protocol, which was initially developed to simplify the creation of NFTs on Solana. However, the program also works with SFTs.

A Mint Account stores only a few data attributes about a token, such as its current supply and authorities. Mint Accounts can’t hold other data that apps and marketplaces use. To overcome this limitation, the Token Metadata program offers a Metadata Account located at a PDA derived from the address of the Mint Account. The Metadata Account incorporates many valuable attributes, allowing regular on-chain tokens to be made into digital assets.

Source: Metaplex Documentation

What is the JSON standard?

The JSON standard is a way to add data to tokens that is stored off-chain, in order to save on the fees involved in storing additional data on-chain. The URI attribute in Metadata Accounts links to an off-chain JSON file which stores useful information on tokens following a certain standard.

To ensure the JSON file cannot be updated, it can be stored using a permanent storage solution such as Arweave. Additionally, the Is Mutable attribute in the Metadata Account can be used to prevent the URI attribute, and other attributes, from being changed.

Source: Metaplex Documentation

What is the relevance of the Token Metadata program to SFTs on Solana?

Token metadata is the way that SFTs on Solana become functional in games or metaverse environments as metadata-heavy objects, such as weapons.

A Semi-fungible Token in Solana consists of a Mint Account with two properties:

  1. It has a supply greater than or equal to 0, (e.g. more than 1 token is in circulation)
  2. It has no decimal places (e.g. whole integers only)

The addition of the Metadata Account keeps track of the fungibility of a token through its Token Standard attribute. The program automatically assigns this attribute, which cannot be updated manually. Additionally, The FungibleAsset attribute represents the token standard for SFTs. 

Source: Metaplex Documentation

The Metadata Account also contains other important information that specifies the SFT as a particular in-game weapon, for example. This information includes the animation or logo which, under the JSON standard, can be stored off-chain using the URI attribute.

Example SFT metadata fields and their descriptions.
JSON example of Solana SFT metadata.

What are the implications of SFTs for the future of web3?

The hybrid nature of SFTs has opened up new possibilities for how tokens can be used to represent complex digital assets in a variety of environments in a cost-effective, highly functional manner.

Although gaming and metaverse use cases are the most popular uses for SFTs, they’re attracting a lot of attention because of their enhanced flexibility and the opportunity to reduce costs by storing data off-chain.

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