Antonis Vardis (; 7 August 1948 – 2 September 2014) was a Greek composer and singer. Born in Moschato, a suburb of Athens, Vardis established a 40-year career as a composer and singer, collaborating
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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc835b48119c9e116053f178c5b988838039e32666cb4da266e64c4b1634373ac. 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/e6e06373-c74f-4689-ba69-beae23f2dfb6.json and https://artists.proofprofile.net/proofs/artist/e6e06373-c74f-4689-ba69-beae23f2dfb6.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0a51442006d739daa1b4be77de717ffe98aa3fc17236efcf2cdd4d87e19eca. Chain 2 (Bitcoin): anchored in block 958117 (2026-07-15T07:36:28Z), 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/GRW019300040.
Sigatiki Imaste Oli Stin Trela / Tragoudame Mazi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505f9123489503ae04846fa7118f7f6d24219c6f7c5240a6501fd357dca9ad6b. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/GRS018600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c6bd8c38c5f87b310a2bc71720f30dc7d4e1ade0e5b2cc1663d5b0890757049. 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/GRS018600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e75daf13d1de4843629b63e8cc0e2dc9065e7299ea7193a445248785f29026. 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/GRS018800086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e58ee1f064185f1b2db10a40482e11cc458c48e5c0a725048c88c128084257e. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/GRW019500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969c203349986a75c025daf8934a0149e57997e1d7b7873fa2027e921ebd36ac. 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/GRW019500043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae184f4122bacdb04bb0a4b9d2300522c8136052d1dbfb0c38feb756a997cda. 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/GRW019500046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7db57115315ca409dcadd8469df6a7ee0297d834d0102e4f2830be3173ad03. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/GRW019500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e24f221bace1328485cb33b731b0cce58a30b8bf2c584203a13297a25c6da41. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GRW019500050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff66b5195f551cad3be011b609cda6b6a2336d4e286717c9a9532ee61d262ee7. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/GRW019700098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7581242e5d2a913e30ebc758eb4f6d8888818be68f686b158e58ad5f3928683e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GRW019700104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9632371d9832bc75338872ffb35e7c8b488dea604a89df58432e19ec8ea2c0a8. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/GRW019700105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407d195dc1125f63ed920a4a38d36019d4255eddb86e14e685c5b408a11856fc. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/GRW019700110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b07756662d0dbd9ae5e28e30f926611bfba25b1b2a18abfb482c44aeda8c953. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/GRW019700112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2f7a99802b3f4d47f696d5240dd3edd61db1f54f727078f9cc093819ae6979. 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/GRW010000187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972c3165167f14aae6e5928a433433d5c7bc39bbb020d7ea327d4488c4c6266f. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/GRHV10200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8448cbec239f563409582b2ae53ba47d98592f7e4714b41da34468541c8d5df9. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/GRW019700099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072c022af1edbc3a1f13d560123076666eca45f31da54c70d664f1dfec34361d. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/GRW019500051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88a1bb9297a76fd22761f02850898e6309d3283b29d28f605a0108b1d76c2b2. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/GRW019300038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c7e450848cc7962de11664511548875bfb2f108eaf49d8630a403d8c1ae503. 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/GRW019900114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf309853d9d2e32a9ebe12e4463485e8f005fffcc90fd1de26b9bb710cede108a. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/GRW019700100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd53345808c8451833fc6e6aa8d877219b0b7d0cc6711ef8f6beeb5aeb3f0f7c8. 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/GRW019300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9deab8de60c8711224720b8f79248c8aaa127e273f1458ddc212f9de6d0874a. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/GRW019500041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f128e5e4c1076c4bf94e8f8cc922baecaf3135f52f9b53b1dfcde7a197d9bf5. 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/GRW010000109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc95b9a0f5e9ea48f72d54ad5a427a043729eab94398e1185711acb80dd1765f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GRHV10300121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd87bcf3ab1c7d16ee0ffedbe5bcdb109758b9b224b5021d471b027234d0ed2b. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/GRHV10600362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5adf58c97ae4f9f123bb5473c53aa268dae2f7ceab269c41fe29738bc1326ff9. 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/GRHV10800225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28646531c3ceb0b8f94d861e6899600d583c6c26dd222b94435f09246cff99dd. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/QM4TX1500479.