thumb|Mattias Ståhl performing in 2019 Mattias Ståhl (born 11 December 1971 in Oskarshamn, Sweden) is a Swedish jazz vibraphonist (also marimba, glockenspiel, clarinet, harmonica, synthesizer, percuss
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 0x095858b1b3ffb4aec9e16a0cf36b7169720a20f586f01457a86546bccff5641e. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/32d8e106-bca0-4214-b4f4-b22870bfcc3d.json and https://artists.proofprofile.net/proofs/artist/32d8e106-bca0-4214-b4f4-b22870bfcc3d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).