Mark Walker
type: MusicGroup
popularity: 7
followers: 206
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x43d717f02269d3f505cd3248ddcfde9cb5c53d8d5b005ad1ed6dff8041f3999f
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/67c2b52c-b260-4894-afa8-4579b3ded9de.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/67c2b52c-b260-4894-afa8-4579b3ded9de.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/67c2b52c-b260-4894-afa8-4579b3ded9de
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x43d717f02269d3f505cd3248ddcfde9cb5c53d8d5b005ad1ed6dff8041f3999f","name":"Mark Walker","registered_at":"2026-06-17T02:09:05Z","symbol":"NIM1247861","token_address":"0x786fa75f07f98cc0f709c07e774e6f8570cfd137","type":"artist","uuid":"67c2b52c-b260-4894-afa8-4579b3ded9de"}
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 0x43d717f02269d3f505cd3248ddcfde9cb5c53d8d5b005ad1ed6dff8041f3999f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67c2b52c-b260-4894-afa8-4579b3ded9de.json and https://artists.proofprofile.net/proofs/artist/67c2b52c-b260-4894-afa8-4579b3ded9de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x43d717f02269d3f505cd3248ddcfde9cb5c53d8d5b005ad1ed6dff8041f3999f","name":"Mark Walker","registered_at":"2026-06-17T02:09:05Z","symbol":"NIM1247861","token_address":"0x786fa75f07f98cc0f709c07e774e6f8570cfd137","type":"artist","uuid":"67c2b52c-b260-4894-afa8-4579b3ded9de"}
album: Second Wind
  type: MusicAlbum
  date published: 2019-12-13