Bidu Sayão
type: MusicGroup
genre: opera
description: thumb|240px|Bidu Sayão as Manon (Massenet), in the season of 1940 of the Teatro Colón in Buenos Aires Balduína "Bidú" de Oliveira Sayão (11 May 1902 – 12 March 1999) was a Brazilian opera soprano. One
popularity: 9
followers: 2079
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xfade810441df0f85fc9446017fa7d7ddeec03c06090f7281eedd0e959926c9f2
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cfbc1661-eec6-4b00-bc1c-bc3b179cb87a.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cfbc1661-eec6-4b00-bc1c-bc3b179cb87a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/cfbc1661-eec6-4b00-bc1c-bc3b179cb87a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xfade810441df0f85fc9446017fa7d7ddeec03c06090f7281eedd0e959926c9f2","name":"Bidu Sayão","registered_at":"2026-06-21T00:39:11Z","symbol":"NIM1765962","token_address":"0x32b571f0170549066c23cad70cf2d71f103acab4","type":"artist","uuid":"cfbc1661-eec6-4b00-bc1c-bc3b179cb87a"}
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 0xfade810441df0f85fc9446017fa7d7ddeec03c06090f7281eedd0e959926c9f2. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfbc1661-eec6-4b00-bc1c-bc3b179cb87a.json and https://artists.proofprofile.net/proofs/artist/cfbc1661-eec6-4b00-bc1c-bc3b179cb87a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xfade810441df0f85fc9446017fa7d7ddeec03c06090f7281eedd0e959926c9f2","name":"Bidu Sayão","registered_at":"2026-06-21T00:39:11Z","symbol":"NIM1765962","token_address":"0x32b571f0170549066c23cad70cf2d71f103acab4","type":"artist","uuid":"cfbc1661-eec6-4b00-bc1c-bc3b179cb87a"}
album: La Boheme
  type: MusicAlbum
  date published: 2000-01-01