AY-o
type: MusicGroup
description: Takao Iijima (born 19 May 1931), better known by his art name Ay-O (靉嘔 Ai Ō),Museum of Modern Art page is a Japanese avant-garde visual and performance artist who has been associated with Fluxus since
popularity: 2
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x331262d4bc896c848534fa0eb305f566048ddbf8e1317451be3df2ed4aa32efc
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954017
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954017
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/3676c860-df23-433e-82f9-a16ee639c792.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/3676c860-df23-433e-82f9-a16ee639c792.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/3676c860-df23-433e-82f9-a16ee639c792
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T23:38:33Z
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 0x331262d4bc896c848534fa0eb305f566048ddbf8e1317451be3df2ed4aa32efc. Chain 2 (Bitcoin): anchored in block 954019 (2026-06-16T23:44:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3676c860-df23-433e-82f9-a16ee639c792.json and https://artists.proofprofile.net/proofs/artist/3676c860-df23-433e-82f9-a16ee639c792.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T23:44:13Z