Proof of Pitch
That moment between sharing your pitch and signing the contract is when your ideas are most exposed. Custosend creates a verifiable record of what you showed, when, and what the recipient accepted.
Free plan · No credit card · Under a minute to first proof
Proof of Pitch Certificate
Brand Proposal v3.pdf
4.2 MB · SHA-256: a3f8c1...9e2d · Apr 8, 2026
Event chain
Private beta · Join 400+ creatives on the waitlist
What you get
A sealed record that you showed this work first.
Every share produces a timestamped, hash-verified record of what was sent, to whom, and under what conditions. Not a read receipt. A verifiable proof artifact that exists independently of both parties.
Confirmation that your work was received and viewed.
Timestamps. Viewer duration. Consent events. Watermark application. Every interaction is captured into an exportable evidence chain. You stop guessing and start knowing.
The conditions that turn a share into proof.
Who was authorized to view. For how long. How many times. Under what watermark. Whether consent was required. Context separates “I sent a file” from “I shared this under documented conditions.”
The power shift
They say
“I never received that proposal.”
Your proof says
Delivery receipt shows link opened Apr 8 at 14:22 UTC. Viewer session: 3m 42s.
They say
“We came up with this concept independently.”
Your proof says
Proof of Pitch certificate: you shared this file (SHA-256 verified) 11 days before their version appeared.
They say
“I only glanced at it, I barely saw anything.”
Your proof says
Event log: 3 views over 2 days, total viewing time 14 minutes, watermark confirmed per session.
They say
“We never agreed to those terms.”
Your proof says
Consent event recorded at 14:22:41 UTC. Viewer accepted share context before accessing the file.
How your proof gets built
Encrypted at rest, hashed for integrity. The original artifact is sealed.
SHA-256 file hash · AES-256 encryption · Timestamp
Who can view, how many times, when access expires, whether consent is required, what watermark appears.
Viewer identity · Expiry · View limit · Watermark · Consent
Your recipient gets a branded viewer link. No app required, no account needed.
Unique share token · Recipient address · Delivery timestamp
They see your branded, watermarked preview. If consent is on, they acknowledge before viewing.
Consent event · Watermark ID · First-view timestamp
Open, view, duration, consent — each interaction is an immutable event in the chain.
View count · Session duration · Masked IP · User agent
A self-contained PDF with the full event chain. Your proof doesn’t depend on us existing.
Signed PDF · Full event chain · File hash · Certificate ID
Result: Your Proof of Pitch certificate
Self-contained PDF. Full event chain. Exists independently — even if Custosend doesn’t.
Who this is for
You send a brand concept to a prospective client. Two months later, a similar concept launches under a different studio.
Your proof certificate shows you shared it 11 days earlier.
You present three campaign directions. The client picks one, then disputes the scope.
Your delivery receipt shows what was shared, when, and what was acknowledged.
You deliver a strategy audit with confidential findings. A month later, the findings appear in a competitor’s pitch.
Your event chain proves they received and viewed your work first.
You share a project proposal. The client ghosts, then claims they never saw it.
Your proof says: opened twice, 8 minutes total, consent recorded.
Category distinction
Custosend is not a better way to send files. It’s the first tool designed to prove what you showed.
No proof of opening. No consent. No control after sending.
No delivery receipt. No watermark. No consent record. No exportable proof.
No access control. No viewer tracking. No proof certificate.
Tells you who opened it. Doesn’t prove what you shared, under what terms, or produce an independent certificate. Built for sales, not creative proof.
Proof of delivery. Proof of opening. Viewer consent. Watermark per viewer. Access control. Exportable proof certificate that exists independently — even if Custosend doesn’t.
Pricing
Beta pricingStart free. Upgrade when the math is obvious.
Free
Test the full workflow
EUR 0
Send a real proposal to a real client. Get your first proof certificate. See exactly what Custosend captures — on a real share, not a demo.
You need this when: You want to try it on a live proposal before committing.
Solo
The serious freelancer’s safety net
EUR 19/mo
EUR 228/year — less than one lost pitch
One disputed pitch costs EUR 2,000–10,000 in lost work or reputation damage. Solo costs EUR 19/mo — EUR 228/year. It pays for itself the first time a client says “I never saw that.”
You need this when: You send proposals regularly and can’t afford to lose a single one without proof.
Studio
For teams managing multiple clients
EUR 49/mo
Higher volume for studios running concurrent client rounds. Every share, every team member, every client — documented and exportable.
You need this when: Your team shares work with multiple clients weekly.
Common questions
Proof of Pitch
Join the private beta. Send your first proof in under a minute.
Free plan · No credit card · Under a minute to first proof
Every pitch you send without proof is a risk you chose to take.