Blockchain-Powered LSTM-Attention Hybrid Model for Device Situation Awareness and On-Chain Anomaly Detection

. 2025 Jul 28;25(15):4663. doi: 10.3390/s25154663

Algorithm 2 Data management contracts

1:
Data Structure: $𝒟 \leftarrow (data, hash, τ, addr)$
2:
State Variables:
- $R : B^{32} \to 𝒟$ ▹ Mapping from record ID to data record
- $A : A \to {0, 1}$ ▹ Authorized devices
- $α \in A$ ▹ Admin address
3:
$α \leftarrow msg . sender$ ▹ Contract constructor
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function uploadData(d, h)
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Require: onlyAuthorized
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$r \leftarrow H (d ‖ τ_{block})$
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$R [r] \leftarrow (d, h, τ_{block}, msg . sender)$
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Emit EventUpload $(r, msg . sender)$
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end function
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function verifyData(r, d)
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if $R [r] . τ = 0$ then
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Revert: “Record invalid”
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end if
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$h^{'} \leftarrow H (d)$
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if $h^{'} \neq R [r] . hash$ then
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Emit EventHashMismatch $(r)$
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end if
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end function
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function checkAnomaly(r, p)
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if $p > 95$ then
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Emit EventAnomaly $(r, p)$
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end if
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end function
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function manageDeviceAccess(a, mode)
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if mode = admin then
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if $msg . sender \neq α$ then
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Revert: “Access denied”
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end if
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else if mode = authorize then
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Require: $msg . sender = α$
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$A [a] \leftarrow 1$
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else if mode = revoke then
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Require: $msg . sender = α$
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$A [a] \leftarrow 0$
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else if mode = check then
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if $A [a] \neq 1$ then
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Revert: “Device unauthorized”
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end if
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end if
40:
end function