Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsA public blockchain is a blockchain network whose rules let anyone read the ledger, submit valid transactions for inclusion, and take part in the consensus process that decides which blocks and state are accepted. Participation is open, not gated by a preapproved membership list. Bitcoin and Ethereum are the best-known examples.
The canonical definition
The most-cited formulation comes from Vitalik Buterin of the Ethereum Foundation, in his post “On Public and Private Blockchains” (August 7, 2015):
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“a public blockchain is a blockchain that anyone in the world can read, anyone in the world can send transactions to and expect to see them included if they are valid, and anyone in the world can participate in the consensus process”
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That sentence contains three separate rights, and each one matters:
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- Read: anyone can inspect the ledger.
- Write: anyone can submit a transaction and expect it to be included if it is valid.
- Validate: anyone can take part in the process that determines accepted blocks.
Underneath, a blockchain is a ledger copied across many computers (nodes). NIST describes the ledger copies being maintained across nodes, with new blocks added according to validation and consensus rules. A public network applies that design without an admission gate.
Public, consortium and private: comparing participation rights
The clearest way to compare network types is to ask who holds each of the three rights.
| Model | Who can read | Who can submit transactions | Who controls consensus |
|---|---|---|---|
| Public (Buterin’s definition) | Anyone | Anyone, if valid | Anyone can participate |
| Consortium | Public or restricted | Depends on the design | A preselected group |
| Fully private | Restricted to varying degrees | One organization centralizes write permission | That organization |
Buterin’s example of a consortium chain is a set of selected institutions each running a node, with a threshold of them required to sign each block. Such a ledger could still be readable by the public, which is why visibility alone does not make a system public in the full sense.
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“Public” is not always the same as “permissionless”
The two words are often used as synonyms, and under Buterin’s definition they largely coincide, because open consensus participation is part of “public.” But the taxonomy is not universal. The European Commission’s Joint Research Centre describes a public permissioned category: the ledger is visible and open for transactions, while only a restricted number of nodes take part in consensus.
Access to data and authority to validate can be configured independently, so not every system fits one neat label. When someone calls a network “public,” ask which of the three rights they mean: public readability, open transactions, or open validation.
How the definition plays out in real networks
Ethereum
Ethereum’s own documentation describes it as permissionless for on-chain use: anyone can take part in on-chain activity, and there are no rules about who can build an application or send a transaction. Its current consensus mechanism is proof of stake, where rewards and penalties apply to staked capital. Adding blocks as a validator requires staking ETH and running validator software.
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So open use does not mean every user is a block validator. Sending a transaction, running a node and validating are different roles. Buterin’s 2015 post is a taxonomy, not a description of today’s mechanics, so check current ethereum.org documentation for consensus details, which change over time.
Bitcoin
Bitcoin’s developer documentation describes the blockchain as a public ledger. Each full node independently stores a chain of blocks that it has validated under the consensus rules. Bitcoin.org describes mining as the distributed consensus system that confirms pending transactions by including them in the blockchain. Bitcoin therefore reaches the same openness through proof of work instead of proof of stake.
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Roles on a public network
- Users read the ledger and send transactions. No approval is needed.
- Node operators run software that keeps and checks a copy of the ledger against the consensus rules.
- Block producers (miners on Bitcoin, validators on Ethereum) propose blocks under the network’s consensus mechanism. On Ethereum that requires staked ETH. Anyone may meet the requirements, but meeting them takes resources.
What the definition does not tell you
Openness of rules is not the same as how decentralized a network is in practice. The definition says nothing about node counts, transaction speed, security or the distribution of validating power. Judge those with separate, sourced measurements for the specific network and date, not from the label “public.”
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