Donald Gramm
type: MusicGroup
genre: neoclassical
genre: opera
description: Donald John Gramm (February 26, 1927 – June 2, 1983) was an American bass-baritone whose career was divided between opera and concert performances. His appearances were primarily limited to the United
popularity: 6
followers: 150
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x3290193b4100e2c8b56c12a11531652c3a64b9d5955db8046e63a376e48acff5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953854
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953854
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0226059d-7ab3-421f-9466-b4b276df34e0.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0226059d-7ab3-421f-9466-b4b276df34e0.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0226059d-7ab3-421f-9466-b4b276df34e0
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T23:16:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x3290193b4100e2c8b56c12a11531652c3a64b9d5955db8046e63a376e48acff5","name":"Donald Gramm","registered_at":"2026-06-15T14:25:08Z","symbol":"NIM0736196","token_address":"0x42ad4f5b780a58705ec9d9cef695bbc4ab5441b8","type":"artist","uuid":"0226059d-7ab3-421f-9466-b4b276df34e0"}
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 0x3290193b4100e2c8b56c12a11531652c3a64b9d5955db8046e63a376e48acff5. Chain 2 (Bitcoin): anchored in block 953854 (2026-06-15T23:16:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0226059d-7ab3-421f-9466-b4b276df34e0.json and https://artists.proofprofile.net/proofs/artist/0226059d-7ab3-421f-9466-b4b276df34e0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T23:16:56Z
  text: {"copyright_id":"0x3290193b4100e2c8b56c12a11531652c3a64b9d5955db8046e63a376e48acff5","name":"Donald Gramm","registered_at":"2026-06-15T14:25:08Z","symbol":"NIM0736196","token_address":"0x42ad4f5b780a58705ec9d9cef695bbc4ab5441b8","type":"artist","uuid":"0226059d-7ab3-421f-9466-b4b276df34e0"}