Stefan Allan Ljungqvist (4 September 1948 – 7 June 2023) was a Swedish singer and actor. Life and career Born in Gothenburg, Ljungqvist began his career in the late 1960s as a member of the band J
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 0xa2b9ea61430cc1a4cc2316391e95f11039ebfe0fc573e379b5a96b21b5e25fcc. 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/09b5bcd8-7655-4267-9b50-6f385ca9a090.json and https://artists.proofprofile.net/proofs/artist/09b5bcd8-7655-4267-9b50-6f385ca9a090.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Stefan Ljungqvist - Västkustens bästa visor
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 0xe4bb4e5a68ef01e1a4daa3fe93948d4c019b38d501dcabd78037b797f2d87649. 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/SEPQM0614583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc3f1c8d051812f4b983eceac466815f9c84e590203c56d30e675f2bf939ccbd. 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/SEPQM0614585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7026647c18d83b40da3da262ffab79ac1ddd05042a47c8911cdf1fc46b5e3a. 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/SEPQM0614586.
Här i vårt vackra vinterland (med Oscar Fredriks Flickkör)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb109d70de7d3a6db4a141ceb30eb7aea54380b7b8a5c0dd46f30d79f041af99. 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/SEPQM0615134.
The Christmas Song (med Oscar Fredriks Flickkör)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26353e0d0496855a82adc255a17cf5448918ca6da00c98d897b446806d54b327. 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/SEPQM0615139.
Sommar sommar - gröna ängar & böljor blå
I solsken - Från "Ringaren i Notre Dame"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f385d2f4c877b52b6441c6c3712822c307838890c5f35890e1aaac9b6201536. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/USWD11677070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356b82d3d3c53395726ba2a79b55e8ac328c645c7673e52f32c6da7a059d8bc9. 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/QM4TX1746016.
Med Lust Och Fagring Stor - Sommarens Sanger Och Psalmer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f29c0743f26900c90e2fc9884940405722125d14325573980b5e104006c271. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKI199269306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708955d3ead04db32db720875980eefd9ef89e4138d662404b13b439c0752e09. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/HKI199269309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb299b5bb8484a1fcd46c5cfeb7c26f985c37a547ec6fa466953cea96ea40a148. 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/HKI199269313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9deee490ca7f1db3d1ee9e14d02464a73a84dec71403b226df262b4d3ad78e4b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKI199269315.