Mark Friedman
type: MusicGroup
description: 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
popularity: 14
followers: 228
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6d53077c73a2e10c3aa3fecc10e3a150c05ca1a618c3adf3d71156187d674f7d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953610
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953610
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/14380d8f-467e-4524-b952-fb920a1d6b4e.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/14380d8f-467e-4524-b952-fb920a1d6b4e.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/14380d8f-467e-4524-b952-fb920a1d6b4e
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T07:58:09Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x6d53077c73a2e10c3aa3fecc10e3a150c05ca1a618c3adf3d71156187d674f7d","name":"Mark Friedman","registered_at":"2026-06-14T06:29:49Z","symbol":"NIM0367461","token_address":"0x394c500fcc6cbf647648a721fdbd56a6bb73a31c","type":"artist","uuid":"14380d8f-467e-4524-b952-fb920a1d6b4e"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: 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).
  date published: 2026-06-14T07:58:09Z
  text: {"copyright_id":"0x6d53077c73a2e10c3aa3fecc10e3a150c05ca1a618c3adf3d71156187d674f7d","name":"Mark Friedman","registered_at":"2026-06-14T06:29:49Z","symbol":"NIM0367461","token_address":"0x394c500fcc6cbf647648a721fdbd56a6bb73a31c","type":"artist","uuid":"14380d8f-467e-4524-b952-fb920a1d6b4e"}
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