ORCID Checksum digit
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Calculating the ORCID Checksum
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The last character in the ORCID ID is a check sum. In accordance with ISO/IEC 7064:2003, MOD 11-2, this check sum must be '0' - '9' though the check digit may also be 'X' (representing the value 10). Below is how to calculate it. Learn more about the ORCID ID Format at http://dev.orcid.org/structure-orcid-identifier
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DIGITORCID IDSub-CalculationCALCULATION
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D1=0SC1=0=D1 * 2
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D2=0SC2=0=(D2+SC1) * 2
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D3=0SC3=0=(D3+SC2) * 2
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D4=0SC4=0=(D4+SC3) * 2
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-
9
D5=0SC5=0=(D5+SC4) * 2
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D6=0SC6=0=(D6+SC5) * 2
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D7=0SC7=0=(D7+SC6) * 2
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D8=2SC8=4=(D8+SC7) * 2
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-
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D9=8SC9=24=(D9+SC8) * 2
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D10=2SC10=52=(D10+SC9) * 2
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D11=0SC11=104=(D11+SC10) * 2
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D12=5SC12=218=(D12+SC11) * 2
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-
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D13=1SC13=438=(D13+SC12) * 2
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D14=2SC14=880=(D14+SC13) * 2
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D15=1SC15=1762=(D15+SC14) * 2
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remainder2=MOD(SC15,11)
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D16 - check=Xresult=MOD(12-remainder,11)
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(if value is '10', digit is 'X')
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Checksum Calculation
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