Johannes Matthias Sperger
type: MusicGroup
description: Johannes Matthias Sperger, also often Johann, (Czech: Jan Matyáš Sperger; 23 March 1750 – 13 May 1812) was an Austrian double bassist and composer. Sperger was born in Feldsberg,At the time of his bi
popularity: 11
followers: 681
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x13b23c044206c8d2993a2949d0f779ccae8892aeeca9ee14168e6ae5475ddb71
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953614
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953614
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/17a6a70d-9dbe-4f34-9d0f-9020d4e4ef95.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/17a6a70d-9dbe-4f34-9d0f-9020d4e4ef95.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/17a6a70d-9dbe-4f34-9d0f-9020d4e4ef95
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T08:40:32Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x13b23c044206c8d2993a2949d0f779ccae8892aeeca9ee14168e6ae5475ddb71","name":"Johannes Matthias Sperger","registered_at":"2026-06-14T06:55:16Z","symbol":"NIM0373541","token_address":"0x8e6d30b6ff41b20c67178de4d1da4f9bb96709ff","type":"artist","uuid":"17a6a70d-9dbe-4f34-9d0f-9020d4e4ef95"}
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 0x13b23c044206c8d2993a2949d0f779ccae8892aeeca9ee14168e6ae5475ddb71. Chain 2 (Bitcoin): anchored in block 953614 (2026-06-14T08:40:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/17a6a70d-9dbe-4f34-9d0f-9020d4e4ef95.json and https://artists.proofprofile.net/proofs/artist/17a6a70d-9dbe-4f34-9d0f-9020d4e4ef95.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T08:40:32Z
  text: {"copyright_id":"0x13b23c044206c8d2993a2949d0f779ccae8892aeeca9ee14168e6ae5475ddb71","name":"Johannes Matthias Sperger","registered_at":"2026-06-14T06:55:16Z","symbol":"NIM0373541","token_address":"0x8e6d30b6ff41b20c67178de4d1da4f9bb96709ff","type":"artist","uuid":"17a6a70d-9dbe-4f34-9d0f-9020d4e4ef95"}
album: Selected Works of J. M. Sperger
  type: MusicAlbum
  date published: 1996-10-26