Markos Vamvakaris (; 10 May 1905 – 8 February 1972), was a Greek musician of rebetiko, universally referred to by rebetiko writers and fans simply by his first name, Markos. The great significance of
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 0x6ac0ce15147e4606185ef3d430bceec4916b5ecba36040bde7d1347f36b31a0c. 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/86967683-93c5-46c7-9147-305de6a47b8c.json and https://artists.proofprofile.net/proofs/artist/86967683-93c5-46c7-9147-305de6a47b8c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sinthetes Tou Rebetikou (Vol. 1 / Remastered)
Sinthetes Tou Rebetikou (Vol. 2 / Remastered)
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 0x958e30031d9ce666775d1e833922f387c879305a40459434015863b354bf9afa. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/GRE013600015.
Sinthetes Tou Rebetikou (Vol. 5 / Remastered)
Sinthetes Tou Rebetikou (Vol. 6 / Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e4eb59d35c8fb0434c53662cf62ce6a2db572bb38ac52d1bb0e9e036f89f6a. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/GRE019800751.
Markos Vamvakaris, the Pioneer / The Best Greek Popular Songs / Recordings 1933 - 1949
Kapote Imouna Ki Egho [1934] - Κάποτε ήμουνα κι εγώ
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9cea7993b6b1e69879b9e4501e26b602959dfa16cadf6e69befb8684f808fd. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GRHR10313704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf7654e28e9cb4e978e08eb4b788d6a16189e1f870845adecde6db14a4821db. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/GRHR10313705.
Markos Vamvakaris Vol. 1 / Singers of Greek Popular Song in 78 rpm / Recordings 1933-1936
Markos Vamvakaris Vol. 3 / Singers of Greek Popular Song in 78 rpm / Recordings 1939-1940
O Antonis o varkaris [1939] - Ο Αντώνης ο βαρκάρης
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f3384cda60ca93dc9150fa8679cb28102d83cf61c75abfeb3311684520e9d0. 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/GRHR10417501.
Markos Vamvakaris Vol. 2 / Singers of Greek Popular Song in 78 rpm /Recordings 1936-1938
Osi ehoune pola lefta [1936] - Όσοι έχουνε πολλά λεφτά
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344e8d432e0aa285205f58776ed1fac5162a461d17e4bb04521e6efe23577231. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/GRHR10417302.
Gerases kai pia de s'agapo [1936] - Γέρασες και πια δε σ' αγαπώ
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded1894274715c7f250a226cd0fd1b0e31e7d96aff9dc8f14ee080db4a7e80fe. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T02:25:23Z), 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/GRHR10417303.
Markos Vamvakaris Vol. 4 / Singers of Greek Popular Song in 78 rpm / Recordings 1940 - 1954
Ta Teleftaia Chronia Tou Markou 1963-1969
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00aaeb258ec24bf45b88771858c8c4d016dbff94325b407fa45b0d7f4ac24249. 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/GRUM70500479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e64c6637c3b18fce5601d47524cfc796d502d6cf876ae506b765c5878b1ade2. 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/GRUM70500480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a530d29a80c776b87f669ff0856fb0e0eaac19e059bd4a7fe7fab7fe873ea4. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/GRUM70500481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd92991b0b7891efda80517a04e4cbad66baa460d2f6221e3ed766e55abc517. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/GRUM70500483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d90e1e06869577b82fc435fb5f28381767c94fd1c5a862060a8d98c8099fad9. Chain 2 (Bitcoin): anchored in block 957919 (2026-07-13T23:58:45Z), 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/GRFM19500400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef90f8138995b18b89776545fc3b4fcd931f38adef9bea9075abb243a09a178. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:36:38Z), 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/GRFM10500466.
Mana Me Machairosan - Mother They Stabbed Me
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18334273166b4eb81a05c64e6540b5c97e5043a0d9f94f5d64c8e9fb76575f98. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/GRFM10100207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028f253c80da8d286a9d60c077961014e9930c1cb0e01d1225a89d5959367fe8. 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/GRFM10500407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3446a4d69d8f5218d9801cf8e6180f56d837167f0475e105764be8c009ef8425. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/USA371651368.
Oloi Oi Rempetes Tou Ntounia (1935-1939), Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe845e0fd65427f8dc764bed92e3963941383f0c5bf057517e4dad0e085cc9845. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/USV291397520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f6fb317ce0bb3517752ddc7a69e573a075be9dfd0d6b0b707605749e429296. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:46:34Z), 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/USV291397522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b603e2ba888aa889e4e09368f720fdd2cd91ba236a52b778a3a95e3614a370e. 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/USV291397524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7eda4b9794e3ed083179e81ec5c9486372493002b34b9c2b6cc4f719032d4b. 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/USV291397528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef715db4931c7d10a4ee0cce45a4367e45252f919fbeabd1497644bd2eb61054. 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/USV291397530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2e4fb84121813bdea89f404f39efb861f5ae3bd1fcffb64b2a71d16a0b6257. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:47:02Z), 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/USV291397535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4665d43d21678fb66fc080ca4708760e47c9c40b60bd008e80f1805288453ce. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T23:02:42Z), 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/USV291397542.
O Markos Ypourgos (Osoi Ginoun Prothypourgoi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66025f6d3bfb43581d6627011410799a89ecdcf9ac8a9a21bff40ad59369fc85. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USV291397543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba13a115f1374ab8d1cb6fef36a5fa511cb796033070bb8602d291c02699589. 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/GRFM10500400.
1905 – 2015: 110 Years Markos Vamvakaris
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9b1e5722f98f8e55d5356042f04d93b524642bc47ea6f8076e898c8bdbba63. 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/GRFM10100698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b040f40be95bdfc92740993d447645139abc7df8089857c6aa4d68f4b14075. 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/GRFM10100818.
Karadouzeni: The Leader of the Piraeus Rebetiko Markos Vamvakaris in 1930's
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff41d7a487bffcc54c368fe46068aa192d56eca6d8a455fb8c1dd301f2a540f. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:52:22Z), 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/GBLPF0231815.
Death Is Bitter [είναι πικρός ο θάνατος]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7385aa33024e00525f08beacbe986e1ba3bc34cf9c1f0739410dab01e6b40412. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GRE014100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e632fb27604c71d754e06d33a9600e3a2afb260dc7830fbbce3141d1cbeaac8. 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/GRE014700169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8c0919b9d1e1feff014b5799de7b4f5d7f9d9eea209eabfef00ad6472866ba. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GRE014900137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1c1603145b53bcb0902aa38f57ce81f04799e25e0a036f59a91cf6845c933e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GRE014700165.