Giannis Papaioannou (; January 18, 1913 – August 3, 1972) was a famous Greek musician and composer born in Kios, Ottoman Empire (now Gemlik, Turkey). In English his name is sometimes romanticized as Y
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 0xe8eb43b43ef1d1c29f0c1a6f7c4fedc55dcefeee07f2e624f94997bd16c8fcd3. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/230acdf8-080a-4826-87f8-7d115172c43c.json and https://artists.proofprofile.net/proofs/artist/230acdf8-080a-4826-87f8-7d115172c43c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
I Megali Tou Rebetikou 1935-1950 (Vol. 4)
Ta Tragoudia Apo To Tileoptiko Afieroma Ston Gianni Papaioannou
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 0x3023eb29b8643536b42567c4772603cd546fc75f98e4d9e2162bfa98f2469b98. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/GRE019400590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0093e1eb2b7615304042d56971086bf1051126984cc6613a991452a153a251. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GRFM19500221.
Giannis Papaioannou - All songs and solos performed by - Recordings 1937-1960