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Blockchain Consulting Engagement Letter Template — What to Expect and What to Include
A well-written blockchain development engagement letter protects both parties and prevents the disputes that consume post-project energy.
Format
Document
Sections
2
Format
Document
Status
Ready to customize
Key Provisions Every Blockchain Development Agreement Must Include
1. Fixed scope definition (with specification document attached): The scope section should reference the Technical Specification Document as Exhibit A. The specification defines exactly what will be built. Any work outside the specification is a change request. 2. Change request process: How scope changes are proposed, reviewed, estimated, and approved. Without a defined process: every 'quick addition' becomes a scope dispute. 3. Milestone-based payment: Recommended: 20–30% upon specification approval, 20–30% at development midpoint (client review of working code), 20–30% upon audit report delivery, 20% upon mainnet deployment. Never 100% upfront. 4. IP ownership: All deliverables (source code, documentation, test suite, deployment scripts) become the property of the client upon final payment. The vendor retains no license or rights to client-specific code. 5. Audit inclusion: Specify: who selects the audit firm, who pays the audit invoice (typically client), what the process is for addressing findings, and what 'audit complete' means (published final report with all Critical/High findings remediated). 6. Support period: Standard: 30-day post-launch support period for bugs in delivered code (not for new feature requests). Define what is covered (defects in delivered code) and what is not (new features, configuration changes, user error). 7. Confidentiality: Mutual NDA — neither party discloses the other's confidential information. The client's business problem and technical architecture are confidential; the vendor's methodologies and tooling are confidential. 8. Liability cap: Standard: vendor liability capped at the total contract value. Neither party liable for indirect or consequential damages. 9. Warranties: What the vendor warrants: the delivered code conforms to the specification, the code compiles and deploys as described, all Critical and High audit findings are remediated. What the vendor does not warrant: future regulatory compliance (regulations change), future performance (blockchain networks change), and third-party protocol behavior. 10. Dispute resolution: Preferred: mediation first (30 days), then binding arbitration (AAA Commercial Rules, specified city). Courts are slow and expensive for technical disputes.
Red Flags in Vendor Contracts
No specification document referenced. If the scope is defined only in emails, there will be a scope dispute. Time-and-materials with no cap. All cost risk sits with you. 'Maintenance' as a catch-all. Post-launch scope must be defined. Vendor retains IP license. You should own everything you paid for. No audit provision. The audit is the client's protection — make sure it is in the contract.
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How to use this template
Template Overview
A well written blockchain development engagement letter protects both parties and prevents the disputes that consume post project energy.
Key Provisions Every Blockchain Development Agreement Must Include
1. Fixed scope definition (with specification document attached): The scope section should reference the Technical Specification Document as Exhibit A. The specification defines exactly what will be built. Any work outside the specification is a change request.
2. Change request process: How scope changes are proposed, reviewed, estimated, and approved. Without a defined process: every 'quick addition' becomes a scope dispute.
3. Milestone-based payment: Recommended: 20–30% upon specification approval, 20–30% at development midpoint (client review of working code), 20–30% upon audit report delivery, 20% upon mainnet deployment. Never 100% upfront.
4. IP ownership: All deliverables (source code, documentation, test suite, deployment scripts) become the property of the client upon final payment. The vendor retains no license or rights to client-specific code.
5. Audit inclusion: Specify: who selects the audit firm, who pays the audit invoice (typically client), what the process is for addressing findings, and what 'audit complete' means (published final report with all Critical/High findings remediated).
6. Support period: Standard: 30-day post-launch support period for bugs in delivered code (not for new feature requests). Define what is covered (defects in delivered code) and what is not (new features, configuration changes, user error).
7. Confidentiality: Mutual NDA — neither party discloses the other's confidential information. The client's business problem and technical architecture are confidential; the vendor's methodologies and tooling are confidential.
8. Liability cap: Standard: vendor liability capped at the total contract value. Neither party liable for indirect or consequential damages.
9. Warranties: What the vendor warrants: the delivered code conforms to the specification, the code compiles and deploys as described, all Critical and High audit findings are remediated. What the vendor does not warrant: future regulatory compliance (regulations change), future performance (blockchain networks change), and third-party protocol behavior.
10. Dispute resolution: Preferred: mediation first (30 days), then binding arbitration (AAA Commercial Rules, specified city). Courts are slow and expensive for technical disputes.
Red Flags in Vendor Contracts
No specification document referenced. If the scope is defined only in emails, there will be a scope dispute.
Time-and-materials with no cap. All cost risk sits with you.
'Maintenance' as a catch-all. Post-launch scope must be defined.
Vendor retains IP license. You should own everything you paid for.
No audit provision. The audit is the client's protection — make sure it is in the contract.