SOSV is an American venture capital firm that provides pre-seed, seed, Series A and later stage funding to deep tech startups that join its startup development programs, which are located in New York
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e24585620c2495038e3b9cec8d069263b75bb1fb44b6136bd54b833c09b2f6. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/852c68ad-949b-4342-93bc-63d8a2647047.json and https://artists.proofprofile.net/proofs/artist/852c68ad-949b-4342-93bc-63d8a2647047.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).