User authentication services using blockchain technology for second-hand sales; Authentication of data in the field of financial transactions using blockchain technology

'authent':2,12 'blockchain':5,22 'data':14 'field':17 'financi':19 'hand':10 'sale':11 'second':9 'second-hand':8 'servic':3 'technolog':6,23 'transact':20 'use':4,21 'user':1

Clearing and reconciling financial transactions via a global computer network; Blockchain-based payment verification services

'base':13 'blockchain':12 'blockchain-bas':11 'clear':1 'comput':9 'financi':4 'global':8 'network':10 'payment':14 'reconcil':3 'servic':16 'transact':5 'verif':15 'via':6

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