Giannis Xanthopoulos (; born 23 June 1967) is a Greek former footballer who played as a defender. He spent 19 years playing in the Alpha Ethniki for Doxa Drama and Ionikos. References External links
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7008ff193996c9da03e70e8f658dd0fc2a725db492151a0e67d9cc6b96c7fc6. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/50a2c5c8-78d6-4445-9bf8-e70cd24ca585.json and https://artists.proofprofile.net/proofs/artist/50a2c5c8-78d6-4445-9bf8-e70cd24ca585.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592403312c10d9dbe49ca3d4fc8c833dabe60a6ad21a10bd7b03bb808c505bd6. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR59R1756668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e3a464eba980fed82b4feae3d341c78bc8c54c2b5dedeeb260d0d9695d55b8. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GRPT12200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ed63db1be03b1fda0dca14607294eb08fccd1d6ace56c26ae1c089c4427255. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GRPT12300063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9171d3acd9eea475b7cee8c09a198b7c5bd6fe12f97177c9e48ef922c5037ce. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GRPT12300162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce256aedb0c9dc6109ebc0b1a06a45381aa7c181e3367362358ff428231de4e. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T13:57:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GRPT12500055.