The word trilemma means difficulty in choosing between three alternatives especially when the three alternatives are very important, now block chain trilemma is the difficulty in choosing between security, scalability and decentralization so it can be called security-scalability-decentralization trilemma to achieve these three essential characteristics in a blockchain network has been a challenge.
Let's discuss these three characteristics that has been difficult to achieve at the same time first we have security.
Security;
Yes security happens to be the process of securing people's transaction from fraud attack and this helps to build the trust of the blockchain network.
There are different elements of security in blockchain cryptography security that uses cryptographic techniques to secure data and transactions and with the use of digital signatures hashing algorithms confidentiality and authenticity of transactions informations are insured.
There is also consensus mechanism which plays a vital role in evaluating and confirming people's transaction in the blockchain, also proof of work and proof of stake secure the block chain from fraudulent attack.
Immutable ledger is another elements of security in the blockchain because it makes sure that's once transaction data is recorded he cannot be edited or deleted so this helps in keeping historical record intact preventing anyone from tampering with the previous or past transactions.
There is also smart contracts security in the blockchain network with self-executing codes that prevents vulnerability and also prevents anyone from stealing from the blockchain.
Scalability.
Scalability some other aspects or characteristics of blockchain network and it refers to the ability of a blockchain system to take care of larger or numerous number of transactions without compromising, some element of scalability is sharding, sharding means dividing the blockchain network into partitions or sections and each section should be able to conduct transactions independently.
Another way to increase lock chain scalability in each through the use of layer 2 solution like lightning network for Bitcoin and the states of channels for Ethereum, this will reduce cost and also fasting transactions because layer2 solutions allows off-chain transactions.
Decentralization is the primary principle of block chain and is a process where investors and participants have a total access to the blockchain network, they conduct their transactions without intermediaries and the blockchain network system does not rely on one central authority.
Decentralized system also consist of consensus mechanism.
Let's analyse blockchain trilemma, for a crypto community to be decentralized it has to be scalable and to be scalable is if not secured means the system is not safe for transactions, now as the transaction increases system slows down and there we need for immutable ledger so as to keep record up-to-date and accurate and also remember that if there is no measure of security hackers will quickly come in and hack people's account and it cannot be said that the network is totally decentralized and if a Blockchain network doesn't scale it will reduce rate of adoption because people will not want to entrust their assest to an unsecured system.
Negative impact of Blockchain trilemma.
Blockchain trilemma has made it challenging for blockchain network to have an appropriate balance between decentralization, security and scalability and this has reduced the performance in the system because as they work so hard to get the right balance between these three attributes it affects or reduces transaction timing and also reduces the ability of handling large number of transactions at the same time.
Also so on the effort of improving scalability some blockchain projects has decided to use only few number of power notes or valued at us and this has in one way compromise decentralization, fact still remains that struggling to balance these three attributes has lead to more computational resources and more energy consumption and this has limited so many people from joining the blockchain network especially people with limited resources or small-scale business owners.
Can Blockchain trilemma be solved?.
So many cryptocurrency space and upcoming blockchain networks are working so hard to get a permanent solution to blockchain trilemma they have done this by improving the consensus mechanism they work so hard provide some other alternative that will be doing some work with consensus mechanism thereby maintaining list three attribute at the same time some other blockchain have decided to use proof-of-stake procedure to achieve consensus while some blockchain use proof-of-History and proof-of-capacity.
Some block chain have created what is known as side chain which is a secondary chain that are built on top of another block chain and then they are connected with bridges, this side chain will not use the same consensus mechanism with the mainnet or parent chain.
Sharding has also been another means to solve blockchain trilemma because when large transaction are broken into smaller shards it will also improve the blockchain network.
Conclusion
Blockchain trilemma is a very difficult challenge that will affect or has been affecting the adoption of Blockchain technology so developers are working soo hard to find a good and permanent solution to this challenge.