Blockchain Glossary

Core terms

Use these definitions as a starting point, then read the linked guides for operational context.

Address: Public information used to identify an on-chain account and receive assets; always interpret it with the network.
Seed phrase: Highly sensitive recovery material. Keep it offline and never share it.
Private key: A secret key used to create signatures and control the related address.
Gas: The network resource cost required to process transactions or contract operations.
Transaction hash: A transaction identifier used to check on-chain status through a block explorer.
Block: A data structure that groups and records transactions on a blockchain.
Confirmation: Additional network history built after a transaction is included in a block.
EVM: The Ethereum Virtual Machine, an execution environment used by many compatible networks.
Smart contract: Program code deployed on a blockchain that can execute state changes.
Token approval: Permission that allows a contract to operate tokens within a defined allowance.
Layer 2: A scaling system that processes some activity away from mainnet and settles through a defined mechanism.
Bridge: A mechanism for moving assets or messages between networks or layers.
DApp: An application that uses blockchain accounts, smart contracts or on-chain data.
Validator: A participant in a PoS network that performs protocol duties such as attestations or block proposals.

Address, private key and seed phrase

Address, private key and seed phrase is a practical part of understanding Blockchain Glossary. A wallet interface is a view into on-chain state, not a substitute for checking the selected network, address and requested action. Before transferring, signing or approving, confirm that the asset, network and counterparty or contract are the ones you intend to use.

A repeatable review process around address, private key and seed phrase helps reduce mistakes caused by rushed confirmations or network mismatches. Start by identifying the source of the request, review the important fields, and only then perform an action that moves assets or creates permissions. On-chain transactions generally cannot be unilaterally reversed by a wallet after broadcast.

For address, private key and seed phrase, turn concepts into information you can verify: check the active network and its parameters, confirm where an address came from, understand any fee or permission, and keep a transaction hash when one exists. If the result differs from expectation, avoid repeated clicks and troubleshoot from network status, on-chain records and request details in that order.

Practical checks

Confirm the object, network and source related to address, private key and seed phrase
Review address, amount, fee, permission or contract details
After the action, keep an on-chain reference you can verify

Blocks, hashes and confirmations

A repeatable review process around blocks, hashes and confirmations helps reduce mistakes caused by rushed confirmations or network mismatches. Start by identifying the source of the request, review the important fields, and only then perform an action that moves assets or creates permissions. On-chain transactions generally cannot be unilaterally reversed by a wallet after broadcast.

From a security perspective, blocks, hashes and confirmations is also about control. imtoken will not ask for a seed phrase, private key or verification code, and those credentials should never be sent to another person. Third-party DApps, smart contracts and network services carry their own risks, so each connection, signature and approval should be evaluated on its own.

For blocks, hashes and confirmations, turn concepts into information you can verify: check the active network and its parameters, confirm where an address came from, understand any fee or permission, and keep a transaction hash when one exists. If the result differs from expectation, avoid repeated clicks and troubleshoot from network status, on-chain records and request details in that order.

Operational guidance

Confirm the object, network and source related to blocks, hashes and confirmations
Review address, amount, fee, permission or contract details
After the action, keep an on-chain reference you can verify

EVM, gas and contracts

From a security perspective, evm, gas and contracts is also about control. imtoken will not ask for a seed phrase, private key or verification code, and those credentials should never be sent to another person. Third-party DApps, smart contracts and network services carry their own risks, so each connection, signature and approval should be evaluated on its own.

It is useful to place evm, gas and contracts inside an end-to-end workflow for Blockchain Glossary: prepare the information, verify the network, inspect the request, perform the action, then confirm the result with a transaction hash or block explorer. This separates wallet display from on-chain outcome and makes troubleshooting clearer when a transaction is delayed or fails.

For evm, gas and contracts, turn concepts into information you can verify: check the active network and its parameters, confirm where an address came from, understand any fee or permission, and keep a transaction hash when one exists. If the result differs from expectation, avoid repeated clicks and troubleshoot from network status, on-chain records and request details in that order.

Practical checks

Confirm the object, network and source related to evm, gas and contracts
Review address, amount, fee, permission or contract details
After the action, keep an on-chain reference you can verify

Layer 2, bridges and approvals

It is useful to place layer 2, bridges and approvals inside an end-to-end workflow for Blockchain Glossary: prepare the information, verify the network, inspect the request, perform the action, then confirm the result with a transaction hash or block explorer. This separates wallet display from on-chain outcome and makes troubleshooting clearer when a transaction is delayed or fails.

Layer 2, bridges and approvals is a practical part of understanding Blockchain Glossary. A wallet interface is a view into on-chain state, not a substitute for checking the selected network, address and requested action. Before transferring, signing or approving, confirm that the asset, network and counterparty or contract are the ones you intend to use.

For layer 2, bridges and approvals, turn concepts into information you can verify: check the active network and its parameters, confirm where an address came from, understand any fee or permission, and keep a transaction hash when one exists. If the result differs from expectation, avoid repeated clicks and troubleshoot from network status, on-chain records and request details in that order.

Operational guidance

Confirm the object, network and source related to layer 2, bridges and approvals
Review address, amount, fee, permission or contract details
After the action, keep an on-chain reference you can verify

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