frame|right|Kostas Roukounas Konstantinos (Kostas) Roukounas (; Principality of Samos, 1903 – Athens, 11 March 1984) was a Greek singer. His repertoire included both "traditional" (δημοτικά) and "popu
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 0x5d28e6ae9199308c5f20f6a7d4cfcc699ed125979bc39dc96f7e771c7207f08c. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/59876b27-ca9d-4a78-b5e3-c0fb29a8d38c.json and https://artists.proofprofile.net/proofs/artist/59876b27-ca9d-4a78-b5e3-c0fb29a8d38c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kostas Roukounas Vol. 1 / Recordings 1932 - 1956 / Singers of Greek folk song in 78 rpm
Kostas Roukounas Vol. 2 / Recordings 1930 - 1934 / Singers of Greek popular song in 78 rpm
Kostas Roukounas Vol. 3 / Recordings 1934 - 1936 / Singers of Greek popular song in 78 rpm
Kostas Roukounas Vol. 4 / Recordings 1934 - 1955 / Singers of Greek popular song in 78 rpm
Nerantzoula: Authentic Folk Songs 1934-1960
Pou Einai Ta Hronia Ta Palia: Authentic Recordings 1931-1937
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 0x3bd9c83dce6ec5ccc1b2f6baf753e355ecc70695726c64a8fcb63c53dfd147a4. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QMFMG1343513.