1
A block is a collection of approximately 1,000 transactions, each containing inputs authorized by digital signatures.
2
New blocks are added to the blockchain approximately every 10 minutes, leading to a linear growth in the overall size of the blockchain (noted as 182 gigabytes in September 2018).
3
Cryptocurrency ownership is secured by secret keys; funds cannot be spent or transferred without a valid digital signature corresponding to the owner's secret key.
4
The liveness property ensures that the system does not get stuck and that no one can prevent honest users from posting valid transactions to the blockchain.
5
The blockchain is entirely public and replicated across many users, allowing anyone to view and verify the validity of all transactions.