De Lyckliga Kompisarna (Swedish for ’The Happy Friends’), DLK, is a Swedish melodious punk band. The band was formed in 1989, split up in 1997, and re-united in 2008. They are probably best known for
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 0xd3643c781fbcea47c84d91e16506685fbe7fb04d38b4a4e6e668f2896775e175. 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/4b8d2d8b-25b5-4f81-8779-ef191f2abd6d.json and https://artists.proofprofile.net/proofs/artist/4b8d2d8b-25b5-4f81-8779-ef191f2abd6d.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 0xd1c8f8d01ac3bed892d85c10cfc817b253871fbac617480c99d842507b8d725b. 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/SEVBZ1101004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72685d3c3a37915865dea3314f2705e2205a60ec4d14542722bc57b742a28798. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/SEVBZ1101005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f7e53cad7e82ef2cb53dd42bf852f847e93bea2aeb6025bbab5bb88aa58ff5. 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/SEVBZ1101006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd588b84a343a8d90ac7a894b7ddf2f36831d5a8d405d7a27ecf42f65a41b8477. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/SEVBZ1101008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd871200f41e2a0b4cf0b36bf12bee73d96b3e6481271d528c31b4dce93b0a6cb. 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/SEVBZ1101010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7487ecaca088fbffce8a41f97f710c6b4b645f4973b637d87907dea29f52777. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/SEVBZ1101011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b265cefda5b662995e95115fa76cd4726cb19167acd9a9ea3a56d60265d3f8c. 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/SEVBZ1101012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ac217f17648061bebdf3d5a0615d4e61a4c6480ecdc73e5bd8db123f190240. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/SEVBZ1101013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8492dd4bbc36e217128795acf1a2b2aa87ec5cfafc65a4cf59658af8c486831b. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/SEVBZ1101016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e11121b2f9ee39ecc63ab1c6d1bc4767560d1618acd6ff0ff2c1981ff836440. 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/SEVBZ1101017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d5b503257c69f100e25bb4efc0156b21bc2263c4be01e50eb86112b1183331. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/SEVBZ1101018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5ae90cbf53e3f054035b157baf26a63c1081368db8737b9f7d785999e443d8. 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/SEVBZ1101603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d0ceb071b301d1a8191d9f7e12d449a47a2981a1937a47725b0334db2b6a76. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/SEVBZ1101605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1699fc822ff044928e553cb92307610d7e1fc716c3b4debf1f54ee8037f413ac. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/SEVBZ1101606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635e697c2c8fbad5275ae02e7f7eeb1eaccf4e88f997f143843cabcaa8c13df0. 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/SEVBZ1101610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88476a39a8381f3ce6cb5ca39d2d7c9993ef216f759447a337248cb1ce607a99. 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/SEVBZ1101611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f092d7303f8c162efe408957a92b45e17fe9ac674e1ec8ba821804700e399ef. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/SEVBZ1101612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7942fb462d0068ee8fe87f7c1831adf638267ca0d90bd82cb34e27f877808de7. 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/SEVBZ1101701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab376cd5370ccde8e3a755cd45e0ad0149938a0887e8dd349299b0433253306d. 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/SEVBZ1101703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e6604e4120cd9786ef2ee412c3aadbae845b951f4ea1c42b0e68d4a1cf2b94. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/SEVBZ1101705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942ef17d02178aab27213c31b97df101ea5c372e9a404f917839672af6c138ac. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/SEVBZ1101707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e88490647f6a4b0205774824be3a6490d77c76d501af35cc36248cbb7e827ec. 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/SEVBZ1105906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185938386a61b88ae9aa95ecc9438ced16f8d4e412ff3f340690fc4ce0dde816. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/SEVBZ1101203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb899229dffc6d92815a460ed2fc513a5775136cd8c8c03032e3dd91d53d3220a. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/SEVBZ1101205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06314cacd30de09307d11a8ec21e88dfcd93c2cdd2e3192f4d391d876e3b2416. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/SEVBZ1101208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9d4c463dd2959c401550e2a5be0972b0a7c621bb2f619dec56cb3be92ac903. 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/SEVBZ1101209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28aa694c9dab658450199a74c907b963ce0f3e3488cdcb598df13ec7a4035a14. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SEVBZ1101210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1699e087441383f6c3c99323da0e23996d4a61dd668e77ea82e9c3ba9d2fc4. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/SEVBZ1101214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4367cefc87bbec03428b1db52a700d402dffbcfc6edc1091b0004f272e276e79. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/SEVVF1000709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e05b7445c11c4ebccf87d7f02d42a9181abb03cf2f2a8ab5ea4ca35082ad9a5. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/SEWTW1300504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2738db7cae63d9d946cc32d8b95207f3af61ccf0960cb04b96d3e564c2956110. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/SEVBZ1500601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe507e5ae7c7e178b31157327abbbc9162de141d8a6f88a4092e2f545c0373f3f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/SEVBZ1500603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7e6bf09a23e332ddd154915c770e5d18a05726ca0c0628e2717da429948843. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/SEVBZ1500604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d937a42c4db27aea129afabd1f79f04b96415e79c45847864ae92e0e63545c. 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/SEVBZ1500607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8900afffe18c5a61b23f687b350e683a8bd61b4dc19a1b3fbfb9673b9d904443. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/SE3D71802601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf70c37e28d4c55e3582553933ac4343563a4fd4010f698a35a69f2f68b0b72. 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/SE3D71802602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854733f95a9525d71e78677f1b998fe00183ca1506bd9633418a8570aa7c674e. 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/SE3D71802608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5845f7181f655601a0e1e681f4f0b523f73939d591105eec723bb11539ea4cb1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEVVH9703106.