Gradify Labs
GradifyLabs
Independent technical comparison · 2026

Solana vs Polygon vs Concordiumfor Academic Credentials

Throughput, cost, finality, regulatory posture, and ₹ per credential at India scale (50M annual). Honest tradeoffs — including where Solana isn't the right choice.

India issues over 50 million academic credentials per year. The blockchain choice for a credential platform is not a philosophical preference — at that volume, it's a line item that ranges from ₹40,000 to ₹2.5 crore depending on the chain.

This page compares the three blockchains used in production credential platforms today: Solana (used by Gradify Labs), Polygon (used by several Indian credential vendors), and Concordium (used by Edubuk and a handful of European platforms). It includes the math, the tradeoffs, and the cases where Solana is the wrong answer.

Side-by-side technical comparison

Sustained throughput (TPS)

Solana

~3,000–5,000 sustained, 65,000 theoretical

Polygon

~7,000 on PoS chain (with caveats)

Concordium

~1,000

Sustained TPS matters because 50M credentials/year ≈ 1.6 TPS average — but exam-result peaks compress 6 months of issuance into 2 weeks.

Cost per credential mint

Solana

₹0.0008–₹0.005 (sub-paisa)

Polygon

₹0.05–₹0.50 (depends on gas spike)

Concordium

Fixed-fee model, ~₹0.10–₹0.30

At 50M credentials/year: Solana ≈ ₹40K–₹250K, Polygon ≈ ₹25L–₹2.5Cr, Concordium ≈ ₹50L–₹1.5Cr per year — before any vendor markup.

Finality

Solana

~13 seconds (1 slot, 32 slots = absolute)

Polygon

~2 minutes for L2 finality, ~30 minutes for Ethereum L1

Concordium

~10 seconds (deterministic)

Finality matters when an employer is verifying within minutes of issuance — convocation-day verification flows fail on slow finality.

Energy per transaction

Solana

~0.0006 Wh (PoH + PoS)

Polygon

~0.0009 Wh (PoS sidechain)

Concordium

~0.0014 Wh (PoS)

All three are far below proof-of-work chains. Differences here are within margin of error for sustainability reporting.

Regulatory posture

Solana

Permissionless, public, used by major US/EU enterprise pilots; Solana Foundation partners with governments

Polygon

Permissionless; Indian-founded company (Polygon Labs) gives some India-narrative comfort

Concordium

Built-in identity layer (ID 2.0) makes it KYC-native — appealing for regulators, restrictive for student SSI

For India: NEP 2020 pushes for self-sovereign student-owned credentials. KYC-at-protocol-level (Concordium) conflicts with this mandate.

Production credential deployments

Solana

Live: Gradify Labs (IIIT Surat), multiple US/EU campus pilots

Polygon

Several Indian credential platforms (varying scale, often pilot-only)

Concordium

Limited production deployments; mostly European pilots

Polygon has the most credential vendors but the least public production scale data. Solana has fewer vendors but the longest live deployments.

Wallet ecosystem (student-side)

Solana

Phantom, Solflare, Backpack — strong UX, mobile-first

Polygon

MetaMask dominant — high friction for non-crypto students

Concordium

Limited; mostly the official Concordium wallet

If a credential lives in a wallet a student doesn't already have, adoption stalls. Solana's mobile wallet UX is closer to a banking app.

Total cost of ownership at India scale

Hypothetical: a state board issuing 50 million credentials per year. Cost ranges show low-end (off-peak) to high-end (gas-spike) estimates. Platform vendor fees are excluded — only the chain-level economics are shown.

Cost lineSolanaPolygonConcordium
Mint cost (50M credentials/year)₹40,000 – ₹2.5L₹25L – ₹2.5Cr₹50L – ₹1.5Cr
RPC / node infrastructureFree public RPCs + paid tier (Helius, QuickNode) ≈ ₹50K–₹5L/yrSimilar — Alchemy, Infura ≈ ₹50K–₹4L/yrSelf-hosted node mandatory for production ≈ ₹3L–₹8L/yr
Wallet onboarding frictionLow — mobile wallets feel nativeHigh — MetaMask install + seed-phrase frictionMedium — but small wallet ecosystem
Estimated total annual TCO at 50M scale₹3L – ₹10L (excl. platform fees)₹26L – ₹2.55Cr₹53L – ₹1.6Cr

The verdict — by use case

For Indian universities at 10K–500K credentials/year

Solana wins on cost, throughput, and student wallet UX. Polygon is acceptable but burns 50–500× more on transaction fees with no offsetting benefit. Concordium's mandatory KYC-at-protocol layer fights against NEP 2020's self-sovereign student model.

For state boards and government schemes (1M+ credentials)

Solana's TPS and cost are decisive. A board issuing exam results to 5 million students cannot afford ₹2 per credential — it adds a ₹1 crore line item that generates no value. Solana's sub-paisa cost makes blockchain anchoring economically rational at scale.

Where Polygon makes sense

If your institution is already deeply integrated with Ethereum tooling (rare for Indian academia), Polygon's EVM compatibility lets you reuse contracts. Otherwise it is paying a premium for compatibility you will not use.

Where Concordium makes sense

If you need protocol-enforced KYC for every party — for example, a professional licensing body where every credential holder must be identity-verified at issuance and again at every verification — Concordium's ID 2.0 saves integration work. For mainstream academic credentials, it is over-engineering.

Common questions

Why does Gradify use Solana instead of Polygon?+
Three reasons: cost (sub-paisa per mint vs Polygon's variable fees that spike to ₹0.50+ during congestion), throughput (Solana sustains higher TPS without resorting to L2 batching), and finality speed (~13s on Solana vs minutes for Polygon-to-Ethereum settlement). At 50M credentials/year — India's national academic volume — these compound into the difference between a viable and unviable economic model.
Isn't Solana less decentralised than Ethereum/Polygon?+
Solana has fewer validators than Ethereum (~1,500 vs 800,000+) but more than most production blockchains used for credentials. For an academic credential use case, the security threshold is 'cannot be tampered with by any single party including Gradify' — Solana clears that threshold by orders of magnitude. Decentralisation matters; over-paying for it doesn't.
Why not a permissioned blockchain like Hyperledger Fabric?+
Permissioned chains require trusting the consortium that runs them — usually the same set of institutions and vendors that issued the credentials. The whole point of public-chain anchoring is that verification works even if the issuing institution shuts down. Hyperledger fits supply-chain consortia; it does not fit student-owned, lifetime-portable credentials.
What if Solana goes down? It's had outages.+
Solana has had network slowdowns and a small number of full-network restarts in earlier years; uptime through 2025 was materially better as the validator client diversity (Agave + Firedancer/Frankendancer) and fee-market reforms landed. Credential anchoring is asynchronous regardless — issuance can queue and retry, and verification queries existing on-chain records that remain accessible from any RPC node even during validator instability. We treat outages as operational risk like any infrastructure dependency, with retry and queue-based architecture; we do not consider it a categorical disqualifier.
Could you switch chains later?+
Yes — Gradify issues W3C Verifiable Credentials, which are chain-agnostic. The credential schema, signature format, and verifier all work on any chain that supports Ed25519 signatures. If a better chain emerges for India's volume profile, migration is a deployment change, not a re-architecture.

See the math against your own enrolment

Send us your annual issuance volume and target integrations. We'll send back a TCO breakdown for Gradify on Solana against your current vendor or chain — itemised, defensible, and free of marketing fluff.

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