Nikos Portokaloglou (, ; born 30 December 1957) is a Greek singer-songwriter and lyricist. He started his career in 1980 as a founding member of Fatme. The band's first, self-titled album was released
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 0x6c0ec6a7df641420eb9b3034b9e2e02fe78d21f07f86bc592a7bbab824dd0e76. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b3d7efb-b2bc-4303-9b78-14ff82806e42.json and https://artists.proofprofile.net/proofs/artist/4b3d7efb-b2bc-4303-9b78-14ff82806e42.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 0x83318a3a74bd27b8885d043eaa93e491f86f59b4883c23e13b8d00464def4e63. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GRUM70603409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e065b9804e16558197b0cf880cb13bc8b8a39233187c8a8c630f4ec78e8fef. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/GRUM70603411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d708d1737c9736b5cb9fd9525062c33d2e8310aa0fb4907df2829029eb9db7c. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GRUM70603412.
Nikos Portokaloglou - I Fatme Ke I Fili Tou
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579797126ae77c6734dd317cd758692a815df0858e83158ec58cdd656fad1f66. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/GRE019100391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22febeaacfa73072112c55e4e5c3854a8f59ab1ce75e2141f02bfdf1e861c228. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:20:59Z), 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/GRUM70700731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fe5648e4045f59fa4da9f7acbf54692798e78d842bf57ac8b98c56ee1d6d95. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:22:32Z), 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/GRUM70603400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45fe8157442513d57ee9d603ae4cf79649f8e635e6a26f5ca0c53b3f23bdd5b8. 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/GRUM70603337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476a5be2352d02fe0589271efcd4a50d93f1cafb3d129a54d9e0cc09aab6304c. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T00:10:03Z), 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/GRUN10100176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439dd16f2621c5867ea3470fa919ecdb51add2a324de611b65474bb4af6141f3. 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/GRUM70603342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8363be275f6c0451245718d2d902e67a9ba0a9eb4dd9264419dfd82d1d5e2d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GRUN10300449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e72c417cffd92da3c0e8a7a61d54b920fad912d5831e3ab7ba42f051cf8fe22. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/GRUN10500406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe799581e1c3c97d8f07a59290e245648889c4767bd1af85bff834e782c47042f. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:36:21Z), 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/GRL011000285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe746a6c531d77659e0272867e10b52f696e16f15eb6a319fb9dcdd1c6932b073. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/GRL011000267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb5cce0d95a1b0d3cb9a7f63715be48312148d5854e0f96dd4e693c79cf725a. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GRL011000272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8120a3b40f6953a13dc2bef5c2e7671317052fa84c73ee03cbade2b04c730e7. Chain 2 (Bitcoin): anchored in block 957810 (2026-07-13T05:55:46Z), 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/GRL011000277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191cf4b9f96145cfd5375b3b352688f12bc2d5eec0ee62b54ece668bc6022908. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GRL011000299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439dd16f2621c5867ea3470fa919ecdb51add2a324de611b65474bb4af6141f3. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:08:25Z), 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/GRUM70603342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d42ee5df151d11ede023587bdfe148ba78c8758ebdfb2edd732473d2f78591c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:42:46Z), 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/GRUM71200155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca6d745b86048b9503ce4355f11b6033b8a672113305f499019a66622237b62. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/GRUM71200168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825af254721be7624f98a202b30d4f58eaf41f8517d9598a3ce9cc58034af82b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GRUM71200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7405f2d0cfdd66174811bdd78f56329f4aef66baeb2d8c87172a4a851d9be47d. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:45:23Z), 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/GRFE11400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5721244242ae2052e3ddb8e4b697e1b477db1cf2b81aff5476cab6db753e318c. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/GRNCP1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79871d0613bf442679e94a624359053c47f67eca873b5ce41d55c10b99c7668. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/GRNCP1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa090dbf94172c57845636499be41dfa97506677796b986cafb706a8cd71bc273. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GRNCP1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4096d5dc93f768e8a5d7b77a2d8cd85b9b0b07b0a6a5e8fdac86c50a28854e2. 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/GRNPO2000001.
To Mousiko Kouti Tou Nikou Portokaloglou
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4e82e2c8227d433776a62f1b9fa7f9dcd95800cee6019cc0761925b589365b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GRNCP2100001.
Ekei Pou Zoume (Apo Tin Tainia Tou Sotiri Goritsa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1442bf7c01646871f315cd287eb23db3d8945015704a309e65e54300557750a8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GRFE11400052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb33496d53abc790513e3958feb0fc196d0e32459d7dd2673cfa65274ef9d582. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GRWAL2000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466d66a45174e299626219cbf9e2f85faf27d6db787b08b7c2e293a32fad0a45. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMDA62452051.