Dona Massin
type: MusicGroup
description: Dona Massin (born 18 February 1917–26 May 2001) was a film choreographer best known for her work on the 1939 film version of The Wizard of Oz. Dona Massin appeared in over 100 films throughout her ca
popularity: 4
followers: 40
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x24376fb55466a2f2f2c7c7181ed6e04f102267d8a1ba9d10dda94e22be500a8c
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/5debfc96-7021-48e8-a805-664712ccd0f3.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/5debfc96-7021-48e8-a805-664712ccd0f3.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/5debfc96-7021-48e8-a805-664712ccd0f3
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x24376fb55466a2f2f2c7c7181ed6e04f102267d8a1ba9d10dda94e22be500a8c","name":"Dona Massin","registered_at":"2026-06-16T22:23:46Z","symbol":"NIM1194112","token_address":"0x7d2fe3f74a6a424d78facb12a91a2ee652d73dc8","type":"artist","uuid":"5debfc96-7021-48e8-a805-664712ccd0f3"}
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 0x24376fb55466a2f2f2c7c7181ed6e04f102267d8a1ba9d10dda94e22be500a8c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5debfc96-7021-48e8-a805-664712ccd0f3.json and https://artists.proofprofile.net/proofs/artist/5debfc96-7021-48e8-a805-664712ccd0f3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x24376fb55466a2f2f2c7c7181ed6e04f102267d8a1ba9d10dda94e22be500a8c","name":"Dona Massin","registered_at":"2026-06-16T22:23:46Z","symbol":"NIM1194112","token_address":"0x7d2fe3f74a6a424d78facb12a91a2ee652d73dc8","type":"artist","uuid":"5debfc96-7021-48e8-a805-664712ccd0f3"}