Vasilis Xenopoulos
type: MusicGroup
description: Vasilis Xenopoulos (; born 20 May 1998) is a Greek professional footballer who plays as a goalkeeper for Super League club A.E. Kifisia. Career Panathinaikos Xenopoulos plays as a goalkeeper and join
popularity: 3
followers: 355
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc4ef43b23e6d041c24077749541ae14d85d09301f28c0d7773f42e4df109f8c5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953907
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953907
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/173d07ab-614b-4704-b99b-9d85d5d58f19.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/173d07ab-614b-4704-b99b-9d85d5d58f19.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/173d07ab-614b-4704-b99b-9d85d5d58f19
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T07:39:24Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xc4ef43b23e6d041c24077749541ae14d85d09301f28c0d7773f42e4df109f8c5","name":"Vasilis Xenopoulos","registered_at":"2026-06-15T21:38:08Z","symbol":"NIM0839513","token_address":"0x996ac144579c6f17863799f8a1093efe458cd631","type":"artist","uuid":"173d07ab-614b-4704-b99b-9d85d5d58f19"}
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 0xc4ef43b23e6d041c24077749541ae14d85d09301f28c0d7773f42e4df109f8c5. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/173d07ab-614b-4704-b99b-9d85d5d58f19.json and https://artists.proofprofile.net/proofs/artist/173d07ab-614b-4704-b99b-9d85d5d58f19.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T07:39:24Z
  text: {"copyright_id":"0xc4ef43b23e6d041c24077749541ae14d85d09301f28c0d7773f42e4df109f8c5","name":"Vasilis Xenopoulos","registered_at":"2026-06-15T21:38:08Z","symbol":"NIM0839513","token_address":"0x996ac144579c6f17863799f8a1093efe458cd631","type":"artist","uuid":"173d07ab-614b-4704-b99b-9d85d5d58f19"}
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  date published: 2024-02-09
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