Do you need a blockchain?

most probably

NO

Based on Wüst, Karl, and Arthur Gervais. "Do you need a Blockchain?" IACR Cryptology ePrint Archive 2017 (2017): 375.

Do you need a blockchain?

definitely

NO

Based on Wüst, Karl, and Arthur Gervais. "Do you need a Blockchain?" IACR Cryptology ePrint Archive 2017 (2017): 375.

Do you need to
store state?

Are there multiple writers of data?

Can you use an always online trusted third party?

Are all writers
known?

Do you need a blockchain?

perhaps

a permissionless blockchain might work

Based on Wüst, Karl, and Arthur Gervais. "Do you need a Blockchain?" IACR Cryptology ePrint Archive 2017 (2017): 375.

Are all writers
trusted?

Is public verifiability required?

Do you need a blockchain?

perhaps

a public permissioned blockchain might work

Based on Wüst, Karl, and Arthur Gervais. "Do you need a Blockchain?" IACR Cryptology ePrint Archive 2017 (2017): 375.

Do you need a blockchain?

perhaps

a private permissioned blockchain might work

Based on Wüst, Karl, and Arthur Gervais. "Do you need a Blockchain?" IACR Cryptology ePrint Archive 2017 (2017): 375.