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Number of papers retrieved from each digital library with relation to the searched keyword combinations
| Keywords | Google Scholar | Springer | ACM DL | Science-Direct |
|---|---|---|---|---|
| Blockchain and (KYC or e-KYC) | 6510 | 533 | 1969 | 150 |
| Blockchain and reputation system and (KYC or e-KYC) | 1820 | 26 | 1924 | 3 |
| Blockchain and verifiable credentials and (KYC or e-KYC) | 914 | 11 | 1364 | 3 |
| Blockchain and reputation system and verifiable credentials and (KYC or e-KYC) | 899 | 4 | 1346 | 0 |
