Jan Smeterlin
type: MusicGroup
description: Jan Smeterlin (7 February 1892 in Bielsko, Austro-Hungarian Empire – 18 January 1967 in LondonBaker's Biographical Dictionary of Musicians, Seventh Edition, Revised by Nicolas Slonimsky, Schirmer Book
popularity: 3
followers: 145
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x77db1b821ee9ad0c79096505820740483748ae96128fbf478c9f9f8ddac11818
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954650
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954650
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d8b62936-ae7f-47b9-b721-9169af40bda6.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d8b62936-ae7f-47b9-b721-9169af40bda6.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d8b62936-ae7f-47b9-b721-9169af40bda6
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T04:51:12Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x77db1b821ee9ad0c79096505820740483748ae96128fbf478c9f9f8ddac11818","name":"Jan Smeterlin","registered_at":"2026-06-21T04:05:20Z","symbol":"NIM1814037","token_address":"0x81445b5a3ade91fc2a67d7fe2fc7722efe0d95b6","type":"artist","uuid":"d8b62936-ae7f-47b9-b721-9169af40bda6"}
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 0x77db1b821ee9ad0c79096505820740483748ae96128fbf478c9f9f8ddac11818. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8b62936-ae7f-47b9-b721-9169af40bda6.json and https://artists.proofprofile.net/proofs/artist/d8b62936-ae7f-47b9-b721-9169af40bda6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T04:51:12Z
  text: {"copyright_id":"0x77db1b821ee9ad0c79096505820740483748ae96128fbf478c9f9f8ddac11818","name":"Jan Smeterlin","registered_at":"2026-06-21T04:05:20Z","symbol":"NIM1814037","token_address":"0x81445b5a3ade91fc2a67d7fe2fc7722efe0d95b6","type":"artist","uuid":"d8b62936-ae7f-47b9-b721-9169af40bda6"}