Lavrentis Machairitsas (; 5 November 1956 – 9 September 2019) was a Greek rock musician from Volos, Thessaly, Greece. Biography Early years Machairitsas was born in Volos and began taking piano
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 0xd3fec368c66f6d41714cc77445f369fd93cdb5fee03db3ce415a2b9da7e61890. 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/aa9e1251-0c33-4420-beba-64080c8aed7f.json and https://artists.proofprofile.net/proofs/artist/aa9e1251-0c33-4420-beba-64080c8aed7f.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 0x2899436680ecb151d5aa15a139aa82f11f36098e2555bd4bec3c1d37a3e03963. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/GRE019100133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd970d28240908f94f2163f830b77a7233304487ddd167ef6f0ebe190b29503. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:07:00Z), 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/GRE019300151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d853e854af1a9fa0e3ce9c7d466b67407d18903b94254f2c473accbbbf4d3bc. 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/GRE019300149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c157560f2b349c53971136dcfef863c39764fa39bc78449a86c4ddbd13c857c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:16:02Z), 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/GRE019400241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd53d89fe5d5f7ff81ea45f374197c8c13a1961190ba40a34b594e588ae601c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GRE019400248.
Didimotiho Blues - Live From Metro, Greece / 1994
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e57d5b083a9e6e71cb55e9e7bc1616c433820b2afa76696128aa780cd11f51a. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T18:24:26Z), 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/GRE019400258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc6b7d2b68c06b8b143f1ec75e152b6bb0f132e353c11459254d3047026f19b. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/GRE019600217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1cdbabb42d30c60176c32a6b88e509992086bf688b7e76d0fc3c4a10d27d1f. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/GRE019600219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd64871ec8d782d87dafeb78742535b709edf336419fdbf584dde56954d680ec. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/GRE019600222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77bb6cfe2ad9b7fecb7642735b5e650f4b78121ef2365e3e7b86da06064795c2. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/GRE019600223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb1a761e7d04627c44d41b28e30a970d883edf0e7a2819b58d5531c2a972675. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GRE019900414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1150ebf33f025f3e92dda346527940537e9291823475efaffab0425c8568c07b. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/GRE010100374.
Efapax (Original Motion Picture Soundtrack)
Banaki Manaki - Live From Red Club, Nicosia, Cyprus / 2004
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7c83a28d69a328e0fa64949a8b24e2690874907eac8f52734065af699b6e30. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/GRE010500936.
Alkionides Meres - Apo Tin Niremvergi Stin Palia Lefkosia (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8466839b6d8712a90deaf220b664cbb61e0caa4b7520596e8c83d0afc815b2. 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/GRE010500929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ecc17a6080729542b90db0ec0dc4a13252e92d22ea50f594553cb5fef02d5d4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GRE010500937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c146cddc723c078559db4fbc3a5650ce1edc21acd80689d968ae850fa48f72. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:56:30Z), 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/GRE010500939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbe3e1cb75e55d28a8301a6ba227f2249a5ce3aaf4817f28574607d680cd93f. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/GRE010600831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4937aa926b3faffa84d05b227b193f2cdcf73c36aa0c70a7bd112e4d8bf60d0. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:24:48Z), 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/GRE010600833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d853e854af1a9fa0e3ce9c7d466b67407d18903b94254f2c473accbbbf4d3bc. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GRE019300149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456440918cb133264501a5c8c94b50b266b84335d54744754ad11a7d4ad79b60. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/GRE010100376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af9f536d396d7b11dff986648319b9ffbe9c367bae90dbbd4a1b684418baa35. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GRE019300154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd53d89fe5d5f7ff81ea45f374197c8c13a1961190ba40a34b594e588ae601c. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T19:18:50Z), 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/GRE019400248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f31b77d3486d1b095f1bebdb560bd457179151daed3e236f634a7d3349ff48. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:38:49Z), 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/GRE019400249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035d7c075f29c80cdb46005fb4f27edc97720af3671d27859127861aae1d3601. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/GRE010500931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10312731a12359d75672b79987db2981d831c3a86fa739d57f07ec847f7bc432. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/GRE019400256.
Petheno Gia Sena (Original Motion Picture Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb593b193543a30c0cd34c3baf0a299b7a2b3892fbcf939d811cd247596828f9d. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/GRE011000391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc86798110847ad85b1cd69add88309edd1133dd6fdaefb35b417c6a1052b1e. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/GRE011200143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b29dec338fafb1e3becc4f3dc9a8baab7fe790b1af30208e1a1c9ee3b50343d. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:05:53Z), 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/GRUM71700419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfde79162eb2457b9d94f43959423a04a613ef233812b30934b7b0d59c7cab46. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:19:20Z), 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/GRUM71700430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908249747a75542ef4c1adcb917614eed6de484a2ef21ed3d75a180935519932. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-17T02:01:08Z), 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/GRUM71700424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca1a71c74b23aaab72a21dee8ae9244c795e6150ed95d72fa0965e444dcc532. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GRHV11800494.
I Kaseta Ton Lavrentis Machairitsas & Nikos Portokaloglou (Oi Kasetes Tou Melodia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc690e2b33fb5a5817a1502a20b2dacc1ebc027b7ca6fc6d916324064125556f4. 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/GRFRS2210029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2056f8da694200754e60870118e3e425e3ef025afef8f1e99d72b5ca03438822. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GRUM71901672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2edf3dc589a9c8b8390b90df1700394a454a121e30d2485e96e02445970d8500. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/GRE011000401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5232843881eadb24b424e98e233bc932cf536251b3942d7348f804461b4e96. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GRFM11900382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a40ca8265e42c5a0b8523a01a973897c82af3b9b3b47f0e320005c881cbb71a. 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/QMDA62452052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1efc8a169c55097a86adacbb84217447befc28789df1510215b402b318afcdd1. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/GRE019600221.
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch