Matthew Robertson
type: MusicGroup
genre: choral
description: Matthew Robertson (born March 9, 2001) is a Canadian professional ice hockey player who is a defenceman for the New York Rangers of the National Hockey League (NHL). He was selected by the Rangers in
popularity: 2
followers: 7
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xef223a8e8fd6f483986ac14f357c0833034aa056fbb9f9d026b2214eb029b47b
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954555
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954555
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/ad61126c-3061-41bb-beb4-4b6bd75654b3.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/ad61126c-3061-41bb-beb4-4b6bd75654b3.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/ad61126c-3061-41bb-beb4-4b6bd75654b3
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T12:10:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xef223a8e8fd6f483986ac14f357c0833034aa056fbb9f9d026b2214eb029b47b","name":"Matthew Robertson","registered_at":"2026-06-20T10:44:47Z","symbol":"NIM1594034","token_address":"0x1f82e354fa7ef7ed2784ad204dc06ec9c6595876","type":"artist","uuid":"ad61126c-3061-41bb-beb4-4b6bd75654b3"}
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 0xef223a8e8fd6f483986ac14f357c0833034aa056fbb9f9d026b2214eb029b47b. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad61126c-3061-41bb-beb4-4b6bd75654b3.json and https://artists.proofprofile.net/proofs/artist/ad61126c-3061-41bb-beb4-4b6bd75654b3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T12:10:20Z
  text: {"copyright_id":"0xef223a8e8fd6f483986ac14f357c0833034aa056fbb9f9d026b2214eb029b47b","name":"Matthew Robertson","registered_at":"2026-06-20T10:44:47Z","symbol":"NIM1594034","token_address":"0x1f82e354fa7ef7ed2784ad204dc06ec9c6595876","type":"artist","uuid":"ad61126c-3061-41bb-beb4-4b6bd75654b3"}