Maria Spacagna
type: MusicGroup
genre: opera
description: Maria Spacagna (born 1946) is an American soprano; she is known for being the first American-born opera singer to play the title role in Madame Butterfly at La Scala in Milan, Italy where the opera pr
popularity: 2
followers: 507
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x9b0d084870ff5b379a3b56cb4e93e7fe16bbf9ab18412c7326689c8a0af51dff
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953930
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953930
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1ec243bc-3a2f-42dc-a577-60cfde0d6a46.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1ec243bc-3a2f-42dc-a577-60cfde0d6a46.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1ec243bc-3a2f-42dc-a577-60cfde0d6a46
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T10:36:13Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x9b0d084870ff5b379a3b56cb4e93e7fe16bbf9ab18412c7326689c8a0af51dff","name":"Maria Spacagna","registered_at":"2026-06-16T00:09:47Z","symbol":"NIM0875707","token_address":"0x716dd0597e79f75a21cb41adab8d0d080622d660","type":"artist","uuid":"1ec243bc-3a2f-42dc-a577-60cfde0d6a46"}
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 0x9b0d084870ff5b379a3b56cb4e93e7fe16bbf9ab18412c7326689c8a0af51dff. Chain 2 (Bitcoin): anchored in block 953930 (2026-06-16T10:36:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ec243bc-3a2f-42dc-a577-60cfde0d6a46.json and https://artists.proofprofile.net/proofs/artist/1ec243bc-3a2f-42dc-a577-60cfde0d6a46.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T10:36:13Z
  text: {"copyright_id":"0x9b0d084870ff5b379a3b56cb4e93e7fe16bbf9ab18412c7326689c8a0af51dff","name":"Maria Spacagna","registered_at":"2026-06-16T00:09:47Z","symbol":"NIM0875707","token_address":"0x716dd0597e79f75a21cb41adab8d0d080622d660","type":"artist","uuid":"1ec243bc-3a2f-42dc-a577-60cfde0d6a46"}
album: Mascagni: Lodoletta
  type: MusicAlbum
  date published: 2015-06-01