Slagsmålsklubben (; often abbreviated as SMK) was a Swedish electronic music group from Norrköping, Östergötland. The group's name is a comically literal Swedish translation of the title of the novel
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 0xdaa0e8219f1400bd908f25c19c3bc8563f7c73cb3e465ccfa705ec62e251c263. 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/7870b82d-283a-4a6f-aa15-a3b0f9ceece7.json and https://artists.proofprofile.net/proofs/artist/7870b82d-283a-4a6f-aa15-a3b0f9ceece7.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 0x2babb0d3e8a136f577a25ec27c42d67748786a7d26c08bb0152d7b1f39cf3cba. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXKD0700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b91e5017a636d5fab5a40bfccbc9e1b9e1c80eeaaaac3d63a76bfc3388961b. 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/SEXKD0700201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b91e5017a636d5fab5a40bfccbc9e1b9e1c80eeaaaac3d63a76bfc3388961b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXKD0700201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2babb0d3e8a136f577a25ec27c42d67748786a7d26c08bb0152d7b1f39cf3cba. 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/SEXKD0700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d142028d0b8dfec3bedc656f8d985f94258bcb87ce23d4a93f01fbd38bb60c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXKD0700202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cacfe1260d812a38828a4cb2401653dfdba8f4b7ad9693e3d18183073ff07bb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXKD0700203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17dac6d4cba8561e6d102a248a0ae278a7e4f5a58dc4a8676fe6ed0df292e5c2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXKD0700204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cc4ba5ef56fe1cccae5a3c645afe43281f27f0c406c460e22b72d5783d68db. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXKD0700205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d102d952d718e812eb2e7a602ee937540e8a9dca45965f0299b61e666869c83. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXKD0700206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fedf62eb3f0cf801661906766034353dde0b9e5c5ccf5dcbf93ce6c53a7237. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXDK0700207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6abe6d075bd2ad9e56994bd214de44b285702c28fb8d46ffd769ad1ae91422a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXKD0700208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153cceebff1cb3811632b25304c6282add6b77e8c553afdcad446718896fb218. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEXKD0700209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d6423eb05ff6785125760644e35455a3319eac8d14dbf17e922eb7990b0026. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/SEXKD0900402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd200508cedebe77de1fe5fb1bea20ccf18aeea3c6756b3abeebfa1545adc3be7. 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/SEXKD0900302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc52deb1db761d4c3494f441c3c7cffeed8579ba5dcfa84488cc20041e44bf72. 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/SEXKD0900303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07245ecdd9118513394aff8446df2c19fd049418010ad16bc4a1c427cdd8a81. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/SEXKD0900304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07da740ee5e16940eb3e421ed12d3059976d2339cdf86c82510c007a47eaf18. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:00:50Z), 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/SEXKD0900201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959a04e3a4190a7235cb635c98dd77f25bcba4d5254da9a3b2ea59074b4c3bd1. 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/SEXKD0900308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff40f083ddca4e4129aa3e12940434d649e0e09d5dcbcf1cc1c791b2473d793. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/SEXKD0900309.
Stora Farliga Rymdprojektet Gar At Pipan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ad63589592b46cf7bc283f3492f6d8343e8d8cac4f47567edd6df8359cb9c8. 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/SEXKD0900311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33581e1d48a8f431222ed612a6153ad443da2e0dca2daae200ece92ec972ca91. 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/SEXKD0900505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17eb44d3ff014b79a6ec0853af1030963ad614c486b1ea1c9a0a502aca7d7d87. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/SEXKD0900507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6f29f00ebe51ae10ab00aa54b555f00ed004d6c46f795d758c97f53ab0931b. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:04:46Z), 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/SEXKD0900513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefaaae4ee203d35c15c7f2337bd08c7d0cf75de29049065204aae0dd11ce9d47. 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/SE2UI1200305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b178a09d32e460856278289853bcb7362becade6ed6dfa159ac13209d7dc49d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/SE2UI1200302.
A to Z: Bestival 2008 (Compiled by Rob da Bank)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d142028d0b8dfec3bedc656f8d985f94258bcb87ce23d4a93f01fbd38bb60c. 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/SEXKD0700202.
A to Z: Bestival 2008: Compiled by Rob Da Bank
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d142028d0b8dfec3bedc656f8d985f94258bcb87ce23d4a93f01fbd38bb60c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEXKD0700202.