Jarkko Martikainen (born 24 October 1970 in Greifswald, GDR) is a Finnish singer, songwriter and member of the rock band YUP. In addition to his musical career, Martikainen has worked as a columnist,
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 0x2c58112310d324bb0000d85a40dd3b3eec1f2b3aa6e4877ed63ae915dc50f272. 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/33739595-ba80-42dc-87de-84596133656e.json and https://artists.proofprofile.net/proofs/artist/33739595-ba80-42dc-87de-84596133656e.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 0x3a14a3c203199a38801b4ad1889e1e32af820130cdb8fc164f8dc24716a3ab76. 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/FIATN0400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423b59ed09e5b27abbdc2088ca8cd3fec8df62e5b63e8cc6559d83ac0659a75d. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:07:37Z), 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/FIATN0400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa12e7a6f9fd9a0fffbea29b80402a265e9fd05ce4f8db8732b3a507c5a8e4a. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/FIATN0400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6706cdd37c7173f8de9708929307d618ab8a70a793fecb3a17aad0433f39b8cf. 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/FIATN0600100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1538e9bfc8954eaba4780f0cf06db34ad4eff64d5e4b5bc2212c7a2becf2cf4. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T12:02:22Z), 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/FIATN0600101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b62d73ff17666c9d107355a98c4c62eefd0c5a31ff146b5cf62edd55fafea0b. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/FIATN0600102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2a64f3cfbb3ddc76f6196c3c3d1976480f97059add39321ddc571a9b627ba1. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:05:09Z), 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/FIATN0600105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe8a499fd98be836a3c8994f29d8e2598c24632a36c12a6658c9a44b2a000d7. 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/FIATN0600107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75608ed1afa3e5d733f7500578e038c7257bb99f3962054ac2829672caa26ef7. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/FIATN0700048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e12e22832fc44da4c7e0950b68aa1561eb485e2aacb31f0261b61a22fa99c8e. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/FIKHY0900018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5521d3acc4f1e7d63c77cc81885dcfe6bb491e74bcfe25620c4a37cee977ee. 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/FI5ST1100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586763d09deb2ae3ba38df4275b108abeabc35674549016e304de1f43d1bebb8. 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/FI5ST1300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981cb04702d52be83315f406f0663330fc1551a69169fffc1febeea653b6fe25. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/FI5ST1300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d32cd598d4efd678795e483794842ef77bb8cc0a210287cf596a6b0d99f523. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/FI5ST1600036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a6e5a6aac2c3ad8b51352838788eba265a48f47b4cfc29c42386cede675c71. 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/FI5ST1600040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8d168b21c8173a02a768e9ce508337abd08ed43d887b6df79d7a44d4e5b19c. 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/FI5ST1800037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa830d7db83af3b882d2d2374bb3da58450eb2df9e14de7a5600e1b12b9a18833. 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/FI5ST1800039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8ed34c03c0ea86547596660099998bbf407a6c71638b62cc0a672f6c9ee7d5. 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/FI5ST1800046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccbee05dbdee9249e99beae54000380d3347860124aa021e1ab0670f56fa4ea. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FI5ST1900059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9c188bbd5e1a08ee98ad70088c9766acb8d45f8b222822fa6cc2ee3fbf84c7. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/FI5ST1900061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8876738278ff6e17491331adf23292cf81dae1bea9b4506f3040bfe6e27f822c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/FI5ST2300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d659f272840d2688f16aed8422c2511b8824d27b01b944e5c35cda9fdc7ddd. 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/FI5ST2300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d744a5b67d751d9177d381e3f0c95e76313741f3f4f788397bb19b144a97c3. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/FI5ST2300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377cc8a76ee0329685a5c31c7629b419203bba23c0d694fdb78616b8e854641d. 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/FI5ST2300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554b3a16420e19e2d19dc353999b131f58743ab126d0774241e5ad1d1b8d2105. 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/FI5ST2300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842346f2558fdab912308ed5adc8403cfe889c054ef79529a5566d8d1ac3be29. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FI5ST2300031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c38db38df95e12b611cc6ca93a1062e11e5f9887224789c5a7db1bb6661e6a0. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FI5ST2300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5583c7170c761273f726f67d1060aac49509fac00c26e2109f34e34a5a71c6b2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FIEFE0700481.