217
type: MusicGroup
genre: progressive metal
description: Year 217 (CCXVII) was a common year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Praesens and Extricatus (or, less frequently, year 970 Ab u
popularity: 3
followers: 152
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x8a9dcf44ee02a3829647697d4606ce0f6c3d2f5fbada2a88c417fb87532508d8
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954346
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954346
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9a5684ff-fd6e-48dc-9b7e-45fc48c04a8e.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9a5684ff-fd6e-48dc-9b7e-45fc48c04a8e.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9a5684ff-fd6e-48dc-9b7e-45fc48c04a8e
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:51:26Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9dcf44ee02a3829647697d4606ce0f6c3d2f5fbada2a88c417fb87532508d8. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a5684ff-fd6e-48dc-9b7e-45fc48c04a8e.json and https://artists.proofprofile.net/proofs/artist/9a5684ff-fd6e-48dc-9b7e-45fc48c04a8e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:51:26Z
album: Atheist Agnostic Rationalist
  type: MusicAlbum
  date published: 2019-05-20
album: MIA
  type: MusicAlbum
  date published: 2021-09-02
album: 自分に酔うてる
  type: MusicAlbum
  date published: 2022-03-22
album: In Your Gaze
  type: MusicAlbum
  date published: 2025-11-07