Carl Friedberg
type: MusicGroup
description: Carl Rudolf Hermann Friedberg (September 18, 1872 in Bingen, Germany – September 9, 1955 in Merano, Italy) was a German pianist and teacher of Jewish origin. Biography He was son of Eduard Friedberg
popularity: 6
followers: 63
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd8f0fcde828d0b5e52c34a991078429fa142fa8f55c4557634a61290d12ff633
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953915
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953915
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1ae8c999-cb7c-4d75-8c79-ddc58c2b2b9d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1ae8c999-cb7c-4d75-8c79-ddc58c2b2b9d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1ae8c999-cb7c-4d75-8c79-ddc58c2b2b9d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T08:36:32Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd8f0fcde828d0b5e52c34a991078429fa142fa8f55c4557634a61290d12ff633","name":"Carl Friedberg","registered_at":"2026-06-15T22:49:09Z","symbol":"NIM0856444","token_address":"0x0f30d89595f4fa2b7cdeeb33752ef110fdeffd23","type":"artist","uuid":"1ae8c999-cb7c-4d75-8c79-ddc58c2b2b9d"}
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 0xd8f0fcde828d0b5e52c34a991078429fa142fa8f55c4557634a61290d12ff633. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ae8c999-cb7c-4d75-8c79-ddc58c2b2b9d.json and https://artists.proofprofile.net/proofs/artist/1ae8c999-cb7c-4d75-8c79-ddc58c2b2b9d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T08:36:32Z
  text: {"copyright_id":"0xd8f0fcde828d0b5e52c34a991078429fa142fa8f55c4557634a61290d12ff633","name":"Carl Friedberg","registered_at":"2026-06-15T22:49:09Z","symbol":"NIM0856444","token_address":"0x0f30d89595f4fa2b7cdeeb33752ef110fdeffd23","type":"artist","uuid":"1ae8c999-cb7c-4d75-8c79-ddc58c2b2b9d"}
album: Miniatures. Hidden Treasures of Heritage Piano
  type: MusicAlbum
  date published: 2024-08-11
album: Am Stillen Herd. Opera Transcriptions from the Golden Age
  type: MusicAlbum
  date published: 2024-08-31
album: "072 Hidden Treasures of the Piano": Orientale
  type: MusicAlbum
  date published: 2025-10-23