Four friends
type: MusicGroup
genre: rockabilly
genre: vocal jazz
description: Four Friends may refer to: "The Four Friends", a term used in Sunni Islam to refer to the Rashidun, the first four Caliphs (namely Ali ibn Abi Talib, Abu Bakr, Umar ibn al-Khattab, Uthman ibn Affan)
popularity: 2
followers: 76
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xeb3ae157509d7787477f6a9fb1acbe273147bdeeb45275b5dffe2f679f716cf7
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954046
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954046
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/414dc20c-afe0-4bae-87ce-8d77dbc9fdbe.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/414dc20c-afe0-4bae-87ce-8d77dbc9fdbe.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/414dc20c-afe0-4bae-87ce-8d77dbc9fdbe
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T04:53:03Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xeb3ae157509d7787477f6a9fb1acbe273147bdeeb45275b5dffe2f679f716cf7","name":"Four friends","registered_at":"2026-06-16T12:18:20Z","symbol":"NIM1049649","token_address":"0x2393ccf961ad5094dbaa926c5cc99e193fb4591f","type":"artist","uuid":"414dc20c-afe0-4bae-87ce-8d77dbc9fdbe"}
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 0xeb3ae157509d7787477f6a9fb1acbe273147bdeeb45275b5dffe2f679f716cf7. Chain 2 (Bitcoin): anchored in block 954046 (2026-06-17T04:53:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/414dc20c-afe0-4bae-87ce-8d77dbc9fdbe.json and https://artists.proofprofile.net/proofs/artist/414dc20c-afe0-4bae-87ce-8d77dbc9fdbe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T04:53:03Z
  text: {"copyright_id":"0xeb3ae157509d7787477f6a9fb1acbe273147bdeeb45275b5dffe2f679f716cf7","name":"Four friends","registered_at":"2026-06-16T12:18:20Z","symbol":"NIM1049649","token_address":"0x2393ccf961ad5094dbaa926c5cc99e193fb4591f","type":"artist","uuid":"414dc20c-afe0-4bae-87ce-8d77dbc9fdbe"}
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