Lars Roger Karlsson (born 24 June 1968) is a Swedish man who committed a series of three murders in Gothenburg in January–February 2001. He grew up in a stable, middle-class environment, performed wel
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 0x6b2aa8d92642c13aa6c6a0ac74b4cc88d9a86b74c261fac32497b82668a40675. 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/593f6477-90a8-4ddd-99c7-d6a17710c78b.json and https://artists.proofprofile.net/proofs/artist/593f6477-90a8-4ddd-99c7-d6a17710c78b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xc02e19cb5aedc67867b2c5d9ef690090b45885268936569c79f4707aaead97b8. 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/SEYWF2500101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326a632af83efe6dc2e3f104abebd5d22449a80dd4aa1f6e33b75223779a0519. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/SEYWF2500102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7af37fcc1ac40cf5c7d57fab382095c4cc68ed193c5d40db60b57ca2cc229c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/SEYWF2500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72aa0ee7d41536a55de5421e7fe544ca19f731ac26a22d9bf9a3661ffa473f8. 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/SEYWF2500104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38701ea84eb415706ba8c112b62b2b3807c227d6dc207153e51d0170b0cd1f22. 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/SEYWF2500105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8fd4f36313d0edb947da4a12dd993ea58db3a8aec6247cfff6fd8be03608de. Chain 2 (Bitcoin): anchored in block 957688 (2026-07-12T09:52:21Z), 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/SEYWF2500106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbafe498253715c5903cb50ee6fc16b264869157b3164a3a11641918f7476935. 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/SEYWF2500107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3821239dee6e9000861884721dbca83a74b9a4148a7ccd43012e6b0edc611e4b. Chain 2 (Bitcoin): anchored in block 957688 (2026-07-12T09:52:21Z), 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/SEYWF2500108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7047e4c97efaeaed93435e001977e31b6a35ea6441bdc479ee3c8edbeb127a. 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/SEYWF2500109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea79065e2f0b8c2f02b04cd44b0166864dc0bd7fce3dbf2bbed0dc8a310a9b2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/SEYWF2500110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ecc3f3e2246162d2bfa859b040b623505a137c641e9236a3af7d70c38a760b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/SEYWF2500111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33c7a98cb2081fe662de7746d76b7b83c2c9172aaf72ad93cd2b5f3755e2265. 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/SEYWF2500112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aaabf3700369d0aea6d77e52858567f596606a6c3b56dd13ce6afe8050eae6a. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/SEYWF2500113.