Timestamped deliverables
Hypothetical. Not a client, not a result.
// The problem
An engineering firm is sometimes asked to prove which version of a report or drawing it issued, and when, and its file server dates are easy to dispute.
// What we would build
Each issued deliverable's fingerprint is recorded on a public blockchain at the moment it is issued, so the firm can later show that a file existed in that exact form at that time without revealing its contents. If an internal log your clients already trust is enough, a database is simpler, and we will say so.
// What is in it
- A fingerprint of each issued file recorded at issue
- Proof of exact content and time, without revealing the file
- A register of what was issued, to whom and when
- Checkable by anyone with the file
- Contracts audited before launch
// Stack
- Next.js
- Solidity
- Base
- PostgreSQL
- DigitalOcean
// estimate
- Build
- ≈ US$66,200 to US$101,000, delivered within 20 weeksCAD 94,300 to 144,300
- Hosting
- ≈ US$176 a monthCAD 250 a month
- Support
- ≈ US$2,500 a monthCAD 3,565 a month
Prices in your currency are estimates from today's Bank of Canada rate. All invoicing is in CAD or USD.
Timeline by milestone
- Discovery
- 2.9 to 3.4 weeks
- Specification
- 0.4 weeks
- Design approved
- 2.4 to 3.9 weeks
- Core features
- 1.4 to 2.4 weeks
- Full build
- 0.9 to 1.4 weeks
- Contracts and tests
- 1.4 to 2.4 weeks
- Testing and fixes
- 0.4 weeks
- Testnet deployment
- 2.9 to 3.4 weeks
- Launch
- 0.9 to 1.4 weeks
- Mainnet
- 0.9 to 1.4 weeks
Outside our hands, and added to the calendar
- An outside audit of the contracts, if you want one
- 2 to 4 weeks
- Your firm's security review
- 4 to 8 weeks
How it is paid
- Deposit 20%
- CAD 18,860 to 28,860
- Discovery 4.2%
- CAD 3,960.60 to 6,060.60
- Specification 5.3%
- CAD 4,997.90 to 7,647.90
- Design approved 4.2%
- CAD 3,960.60 to 6,060.60
- Core features 12.6%
- CAD 11,881.80 to 18,181.80
- Full build 8.4%
- CAD 7,921.20 to 12,121.20
- Contracts and tests 16%
- CAD 15,088 to 23,088
- Testing and fixes 4.2%
- CAD 3,960.60 to 6,060.60
- Testnet deployment 5.3%
- CAD 4,997.90 to 7,647.90
- Launch 4.2%
- CAD 3,960.60 to 6,060.60
- Mainnet 5.6%
- CAD 5,280.80 to 8,080.80
- Holdback, 30 days after launch (10%)
- CAD 9,430 to 14,430