Equation
type: MusicGroup
genre: acoustic folk
genre: celtic
genre: folk
description: thumb|right|300px|The first use of an equals sign, equivalent to 14x + 15 = 71 in modern notation. From The Whetstone of Witte by Robert Recorde of Wales (1557).Recorde, Robert, The Whetstone of Witte
popularity: 4
followers: 578
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xee75457dde145fe925fd355ad096e81b41f25a0dd10dcd98820e57045279be08
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953886
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953886
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0b5f5b6e-2d3d-4c5a-871e-f43fb0f8ba52.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0b5f5b6e-2d3d-4c5a-871e-f43fb0f8ba52.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0b5f5b6e-2d3d-4c5a-871e-f43fb0f8ba52
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T04:37:45Z
additional property: OTSCanonicalRecord
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 0xee75457dde145fe925fd355ad096e81b41f25a0dd10dcd98820e57045279be08. Chain 2 (Bitcoin): anchored in block 953886 (2026-06-16T04:37:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b5f5b6e-2d3d-4c5a-871e-f43fb0f8ba52.json and https://artists.proofprofile.net/proofs/artist/0b5f5b6e-2d3d-4c5a-871e-f43fb0f8ba52.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T04:37:45Z
album: The Theory Of Housativity
  type: MusicAlbum
  date published: 1991-08-02
album: Hazy Daze
  type: MusicAlbum
  date published: 1998-02-02
album: The Dark Ages EP
  type: MusicAlbum
  date published: 2000
album: First Name Terms
  type: MusicAlbum
  date published: 2002