The 17th Letter
type: MusicGroup
popularity: 3
followers: 10
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x14bfd3913d8fd212757c5586e1998fb5223dccf762905b61d24101de00098cb5
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/b382f0bb-f89a-4cca-aed4-c78ebc6c77d2.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b382f0bb-f89a-4cca-aed4-c78ebc6c77d2.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/b382f0bb-f89a-4cca-aed4-c78ebc6c77d2
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x14bfd3913d8fd212757c5586e1998fb5223dccf762905b61d24101de00098cb5","name":"The 17th Letter","registered_at":"2026-06-20T13:31:49Z","symbol":"NIM1622901","token_address":"0x68e47af74ab9a2f33f76711f6338f01f05f7bde9","type":"artist","uuid":"b382f0bb-f89a-4cca-aed4-c78ebc6c77d2"}
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 0x14bfd3913d8fd212757c5586e1998fb5223dccf762905b61d24101de00098cb5. 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/b382f0bb-f89a-4cca-aed4-c78ebc6c77d2.json and https://artists.proofprofile.net/proofs/artist/b382f0bb-f89a-4cca-aed4-c78ebc6c77d2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0x14bfd3913d8fd212757c5586e1998fb5223dccf762905b61d24101de00098cb5","name":"The 17th Letter","registered_at":"2026-06-20T13:31:49Z","symbol":"NIM1622901","token_address":"0x68e47af74ab9a2f33f76711f6338f01f05f7bde9","type":"artist","uuid":"b382f0bb-f89a-4cca-aed4-c78ebc6c77d2"}
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  type: MusicAlbum
  date published: 2021-02-02
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