Martin Ivanov
type: MusicGroup
genre: classical piano
description: Martin Ivanov (, born 11 July 1988, Sliven) is a Bulgarian judoka. At the 2012 Summer Olympics he competed in the Men's 66 kg, but was defeated in the second round by Sergey Lim of Kazakhstan. Refere
popularity: 12
followers: 124
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x55f9ef2a2d63429cf3ce08537503a1c5ea42328c4b364c54b96a3c09b730d350
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 953714
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953714
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/81b748af-6c2d-4530-b187-290adc3221b6.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/81b748af-6c2d-4530-b187-290adc3221b6.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/81b748af-6c2d-4530-b187-290adc3221b6
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T00:43:59Z
additional property: OTSCanonicalRecord
  type: PropertyValue
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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 0x55f9ef2a2d63429cf3ce08537503a1c5ea42328c4b364c54b96a3c09b730d350. Chain 2 (Bitcoin): anchored in block 953714 (2026-06-15T00:43:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81b748af-6c2d-4530-b187-290adc3221b6.json and https://artists.proofprofile.net/proofs/artist/81b748af-6c2d-4530-b187-290adc3221b6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T00:43:59Z
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album: The Night of Halloween
  type: MusicAlbum
  date published: 2019-10-15
album: Celebrating Special Piano Moments
  type: MusicAlbum
  date published: 2024-09-28
album: Mozart - Sonatas for piano
  type: MusicAlbum
  date published: 2024-10-10