Jan Lundgren (born 22 March 1966) is an internationally active Swedish jazz musician. He is a pianist, composer, and senior lecturer at the Malmö Academy of Music, where he has taught since autumn 199
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 0x40095380edea7afb6411430e51675bd9d36af28b937191e9b18a18b19f9a6cb4. 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/502ea962-c978-4c36-8ed0-0331d0491a5f.json and https://artists.proofprofile.net/proofs/artist/502ea962-c978-4c36-8ed0-0331d0491a5f.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 0x021e4f6d591bebdb94d20df0778abf740258bc20bdde1e5531b69175c61dbe0f. 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/DEA892100265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51279dcc5039688a521116eb9efff2e8fa0e30d9bd758d4c5af5e015551bbaaf. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:04:43Z), 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/DEA892100261.
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 0x609889864e776807ec7e1cbe1b31119f7a60669476344af0d3675d43bb8db89c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:59:38Z), 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/DEA892100263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ecca4ae0ee4dc5d1242594205d4b346d8cd42a4b90b98895be282ca2134dc2. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:40:58Z), 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/DEA892100266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6f9916aa8a9c342aadbaea524b843e1d67fe691552d93d8a41e64014ece6d8. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEA892100260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277e7ed1b69d289e2549829c3a95763a85441a9e8ac761e3ffe406b461fce7ff. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEA892100262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c09bb13f85568997876ef3a19f5096f960ee1f2dfd66bfc4c1a7922f134ebaf. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DEA892100264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a599eb15943168d7d721c0559b277ff7a455db0d795355fffbc2caf2374697. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/DEA892100267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c409eef48efd63d75244698ea4498ae7d20c83115ba25fdeca3e216f5e10a7. 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/DEA891700359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725ee3c12ba0d681898bda2c1cadea1392fc3f04bc3c4a6e5cb822dadfa3d321. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA891700358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db7c700f20eecac1256de912cd7d3e9d855f472290dc2bbf605c8d9966097b8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA891700360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd426be90e96a08413fef023a469e8c39cdaa53f4a33c8d166ef1a03bf6523ceb. 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/DEA891700364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0515f9211e459ec3591efbfa1435b5c5c1adbbc6b9d7ff66507b6c9502fbb0e. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEA891700355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a301e0d4067f2d28a7c6276e50a2a77bcd17092863040291ca8f290c3991d0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA891700357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e56be34ee4520c7bdbbeb3dc8c6627d7ad4ddf9ab804ece80e6b3b0ebe6dd3. 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/DEA891700362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f5d4b7e08a5e0d762f688838556f582d90218db7b8eca12868c23ea4b6b734. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEA891700356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2da3aeba56a943a169a467189a2f347e15753cf02ee3eb4d25ba9e2f3fb0df5. 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/DEA891700366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5c2e6239184c6e70deae94fa754c387b3873c7edb01bfbb91d11a7599a8b1c. 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/DEA891700367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b9148d5d7deafd51a2f7e7d57670912e27468c7b9581301c520c59aeb1e069. 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/DEA891700361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa8142417b02aaba30f0916a73933fbccee48d4348f2d39f6e1c008a08d3a3d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEA891700363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07decc8afd6a24f95a8a47789dea438927abd3693382c5a21a92c1da40acac7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEA891700365.