Mark Isaac Friedman (born December 25, 1995) is a Canadian professional ice hockey defenceman for Rögle BK of the Swedish Hockey League (SHL). He was selected 86th overall in the 3rd round of the 2014
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 0x6d53077c73a2e10c3aa3fecc10e3a150c05ca1a618c3adf3d71156187d674f7d. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14380d8f-467e-4524-b952-fb920a1d6b4e.json and https://artists.proofprofile.net/proofs/artist/14380d8f-467e-4524-b952-fb920a1d6b4e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Age to Age: Songs for the Worshipping Assembly
We Shall Prepare: An Advent & Christmas Cantata for Young People (Instrumental Tracks)