Andrey Sirotkin (born 6 March 1985) is a Russian professional boxer. Professional career Sirotkin vs. Ryder John Ryder (26–4-0) faced undefeated Sirotkin. Sirotkin gave Ryder problems early in the f
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bab4ea9822e2f83286ddc06fd9e2379aaf7c1fd49ea9758a0d0037a4736543a. 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/8693d4d2-f26b-4d78-9c5a-d32458dcdfbb.json and https://artists.proofprofile.net/proofs/artist/8693d4d2-f26b-4d78-9c5a-d32458dcdfbb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
In the Middle of Nowhere (Music from Space - Dimension B)