John Featherstone
type: MusicGroup
description: John Barton Featherstone (May 7, 1949 – March 20, 2021) was an American junior college football coach. He was the head football coach for El Camino College from 1985 to 2015. With the Warriors, he hel
popularity: 5
followers: 367
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x6ce7a27e998810889fb3cff769cf4e594a94bb9452d7b367942da9a8e2df6ad7
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954587
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954587
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/baf95279-4154-46f6-87c3-6ec8aba6b5fe.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/baf95279-4154-46f6-87c3-6ec8aba6b5fe.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/baf95279-4154-46f6-87c3-6ec8aba6b5fe
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T19:10:41Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x6ce7a27e998810889fb3cff769cf4e594a94bb9452d7b367942da9a8e2df6ad7","name":"John Featherstone","registered_at":"2026-06-20T17:08:26Z","symbol":"NIM1661506","token_address":"0x069b7c5b691590daa13f7071df8d78d715e58823","type":"artist","uuid":"baf95279-4154-46f6-87c3-6ec8aba6b5fe"}
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce7a27e998810889fb3cff769cf4e594a94bb9452d7b367942da9a8e2df6ad7. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/baf95279-4154-46f6-87c3-6ec8aba6b5fe.json and https://artists.proofprofile.net/proofs/artist/baf95279-4154-46f6-87c3-6ec8aba6b5fe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T19:10:41Z
  text: {"copyright_id":"0x6ce7a27e998810889fb3cff769cf4e594a94bb9452d7b367942da9a8e2df6ad7","name":"John Featherstone","registered_at":"2026-06-20T17:08:26Z","symbol":"NIM1661506","token_address":"0x069b7c5b691590daa13f7071df8d78d715e58823","type":"artist","uuid":"baf95279-4154-46f6-87c3-6ec8aba6b5fe"}
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