Don Messer
type: MusicGroup
genre: polka
description: Donald Charles Frederick Messer (May 9, 1909 – March 26, 1973) was a Canadian musician, band leader, radio broadcaster, and defining icon of folk music during the 1960s. His CBC Television series Don
popularity: 4
followers: 403
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc42e7a6bc8ce26cbfd76bd8ed200af5fa9f93207b89430714b2001a42e0dd656
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954784
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954784
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f77de33c-6ca3-4e7f-abe5-a343fcd19e1a.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f77de33c-6ca3-4e7f-abe5-a343fcd19e1a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/f77de33c-6ca3-4e7f-abe5-a343fcd19e1a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-22T02:53:59Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xc42e7a6bc8ce26cbfd76bd8ed200af5fa9f93207b89430714b2001a42e0dd656","name":"Don Messer","registered_at":"2026-06-21T15:43:20Z","symbol":"NIM1963011","token_address":"0x8b4e7b5b3d18626e9fa1b7fb684b0ea150f140bb","type":"artist","uuid":"f77de33c-6ca3-4e7f-abe5-a343fcd19e1a"}
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 0xc42e7a6bc8ce26cbfd76bd8ed200af5fa9f93207b89430714b2001a42e0dd656. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f77de33c-6ca3-4e7f-abe5-a343fcd19e1a.json and https://artists.proofprofile.net/proofs/artist/f77de33c-6ca3-4e7f-abe5-a343fcd19e1a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-22T02:53:59Z
  text: {"copyright_id":"0xc42e7a6bc8ce26cbfd76bd8ed200af5fa9f93207b89430714b2001a42e0dd656","name":"Don Messer","registered_at":"2026-06-21T15:43:20Z","symbol":"NIM1963011","token_address":"0x8b4e7b5b3d18626e9fa1b7fb684b0ea150f140bb","type":"artist","uuid":"f77de33c-6ca3-4e7f-abe5-a343fcd19e1a"}
album: Waltz Entry
  type: MusicAlbum
  date published: 2013-12-08
album: Plaza Polka
  type: MusicAlbum
  date published: 2014-01-27
album: Plaza Polka
  type: MusicAlbum
  date published: 2014-08-23
album: Golden Hits
  type: MusicAlbum
  date published: 2014-08-28