David Longdon
type: MusicGroup
genre: progressive rock
genre: symphonic rock
description: David Longdon (17 June 1965 – 20 November 2021) was a British singer and multi-instrumentalist, who was best known as the lead vocalist and co-songwriter of the progressive rock band Big Big Train. Be
popularity: 5
followers: 448
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xa5d675ffea44db74577ac5e353c9806238ae792a82ed50ba2cec10e844f537c5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b1fb21c3-21c4-47f4-95a8-256a6fa5edc9.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b1fb21c3-21c4-47f4-95a8-256a6fa5edc9.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/b1fb21c3-21c4-47f4-95a8-256a6fa5edc9
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xa5d675ffea44db74577ac5e353c9806238ae792a82ed50ba2cec10e844f537c5","name":"David Longdon","registered_at":"2026-06-20T12:49:46Z","symbol":"NIM1615087","token_address":"0x6625a69dfae2687cb6aa0b64b32a4c43990c5281","type":"artist","uuid":"b1fb21c3-21c4-47f4-95a8-256a6fa5edc9"}
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 0xa5d675ffea44db74577ac5e353c9806238ae792a82ed50ba2cec10e844f537c5. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1fb21c3-21c4-47f4-95a8-256a6fa5edc9.json and https://artists.proofprofile.net/proofs/artist/b1fb21c3-21c4-47f4-95a8-256a6fa5edc9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xa5d675ffea44db74577ac5e353c9806238ae792a82ed50ba2cec10e844f537c5","name":"David Longdon","registered_at":"2026-06-20T12:49:46Z","symbol":"NIM1615087","token_address":"0x6625a69dfae2687cb6aa0b64b32a4c43990c5281","type":"artist","uuid":"b1fb21c3-21c4-47f4-95a8-256a6fa5edc9"}
album: Door One (Japan Edition)
  type: MusicAlbum
  date published: 2022-11-09