Blockchain Engineering Decision Guides
Protofire's neutral, engineer-written comparisons for regulated onchain products: stablecoins, payment rails, tokenized funds, MiCA, DORA, custody and chains.
21 decisions covered, 123 options compared, 254 questions answered and 1,339 primary sources cited.
Stablecoins and payments
Which coin, deposit token, payout rail or agent protocol carries the money.
- What backs the dollar you issue?Fiat-backed, Crypto-backed (CDP), Algorithmic, Synthetic (delta-neutral)Stablecoin model · 4 options · October 2026
- Which euro token to integrate, and when to issue your own?EURC (Circle), EURCV (SG-FORGE), EURI (Banking Circle), EURe (Monerium), EURØP (Schuman Financial), EURQ (Quantoz), EURAU (AllUnity)Euro stablecoin · 7 options · October 2026
- Deposit token, stablecoin, or tokenized fund?Deposit token, Bank-issued stablecoin or e-money token, Third-party stablecoin, Tokenized MMF sharesOnchain money for banks · 4 options · October 2026
- Which rail pays out in stablecoins for you, and whose license covers each payout?BVNK (Mastercard), zerohash, Bridge (Stripe), Circle Payments Network (CPN), Fipto, Ripple Payments, Yellow Card, Several rails behind one routing layerStablecoin payout rail · 8 options · October 2026
- How should an AI agent pay, and how do you get paid by one?x402, MPP (Machine Payments Protocol), ACP (Agentic Commerce Protocol), UCP (Universal Commerce Protocol), AP2 (Agent Payments Protocol), Card network agent programsAgentic payment protocol · 6 options · October 2026
Tokenized funds and assets
Who tokenizes a fund, which token standard it uses, and where it can be held or borrowed against.
- Who keeps the fund's register once it is tokenized?Securitize, Tokeny (Apex Group), Kinexys by J.P. Morgan, Allfunds Blockchain, Calastone (SS&C), Spiko, CACEIS (Crédit Agricole CACEIS), Your own stack, with an engineering partnerFund tokenization provider · 8 options · October 2026
- What carries the compliance rules, the token or the paperwork?ERC-3643 (T-REX), ERC-1400, Permissioned ERC-20RWA token standard · 3 options · October 2026
- A dollar that spends, or a dollar that earns?Fiat stablecoins, Tokenized treasuries & MMFs, DeFi yield-bearing dollarsOn-chain dollar · 3 options · October 2026
- Who lends against tokenized funds and loan tokens (BUIDL, JAAA, PRIME), and at what LTV?Aave Horizon, Morpho, Kamino (Solana), Exchange and prime-broker margin, Bank collateral networks, Your own marketLending against tokenized assets · 6 options · October 2026
Regulation, custody and risk
Licenses, Travel Rule and DORA duties, custody models and privacy for regulated firms.
- Authorization, notification, token issuance or a partner's license: which MiCA route fits your crypto product?CASP authorization, Article 60 notification, EMT issuance, ART issuance, Title II white paper, Partner license, PSD2 add-on, Outside MiCAMiCA license route · 8 options · October 2026
- Rent a licensed rail, or run your own custody?Sygnum, Boerse Stuttgart Digital, Bitpanda Enterprise, Crypto Finance, Kraken Embed, Own custody on licensed technologyCrypto-as-a-service for banks · 6 options · October 2026
- Which counterparties can your Travel Rule setup reach, and who runs it?TRUST, Notabene, Sumsub, 21 Analytics, TRP and TRISA (OpenVASP), GTR (Global Travel Rule), VerifyVASP (with Sygna) and CODE, In-house build on an open protocolEU Travel Rule solution · 8 options · October 2026
- ICT provider, financial service or plain dependency: which is each onchain vendor?Custody technology, Regulated custodian or EMT issuer, Staking or validator operator, RPC or node provider, Oracle network, Analytics, KYT or Travel Rule vendor, Smart contract engineering firm, The public blockchain, Hyperscale cloud beneath the vendorsDORA third-party risk · 9 options · October 2026
- Self-custody, MPC, or a chartered custodian?Safe (multisig), Fireblocks (MPC), Qualified custodianCrypto custody model · 3 options · July 2026
- Which privacy design hides your transactions from rivals and still opens them to a supervisor?Canton Network, Private EVM ledgers, Private validiums and zones, FHE confidential tokens, Confidential token features, ZK shielded pools on public EVM, Privacy-native chains, TEE confidential computing, A privacy layer built for your EVM chain or productOnchain privacy for institutions · 9 options · October 2026
Chains and infrastructure
The networks, rollup stacks, messaging, data and engineering partners a product runs on.
- Open public chain, public network with approved validators, or private ledger: where should a regulated product settle?Ethereum mainnet, Base and Arbitrum (Ethereum L2s), Solana, Stellar and XRP Ledger, Avalanche and Polygon PoS, Canton Network, Arc (Circle), Tempo (Stripe and Paradigm), Private and permissioned ledgersInstitutional blockchain · 9 options · October 2026
- Optimistic or ZK, and whose stack?OP Stack, Arbitrum (Orbit), Polygon CDK, ZK Stack (ZKsync)Rollup framework · 4 options · July 2026
- Which messaging layer, and whose security model?Chainlink CCIP, LayerZero v2, Wormhole, Axelar (Mobius), HyperlaneCross-chain protocol · 5 options · July 2026
- Subgraph, streaming engine, or your own indexer?The Graph, Goldsky, Envio (HyperIndex), PonderBlockchain indexer · 4 options · July 2026
- Whose economic security do you rent?EigenLayer (EigenCloud), Symbiotic, BabylonRestaking layer · 3 options · July 2026
- In-house, agency, staff aug, studio, or partner?In-house team, Generalist agency, Staff augmentation, Security audit firm, Venture studio, Engineering partnerWeb3 development partner · 6 options · August 2026
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