Viktor Widkvist (1881–1952) was a Swedish military musician and composer. Career He was born Viktor Magnus Widkvist in Stockholm in the Jakob och Johannes parish on 27 December 1881. Viktor was the
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 0x80a4af9be09908624cda3f9ef3b2b543799821618d5435ff086853f8ee2df697. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9fd89706-5910-4088-9746-5cb185c72a76.json and https://artists.proofprofile.net/proofs/artist/9fd89706-5910-4088-9746-5cb185c72a76.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Swedish March Favorites (GöteborgsMusiken)
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 0xe277cfdaf4251e0bbcccdaf78c2f518b388360eb0fba39761bf1e69d97d8600c. 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/HKI199314504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x201a0c6c6cbe041ba0da4b41caa1fe226d87ffeafe9322b90673953ac36d19a1. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/HKI199314515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3750547ed32abf45074c4c5d88b9929c062d22bf87838b4d6fb704b2403b533. 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/SERLE9803040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a924fb1ca0a3576f56bb9140ff8e89201755500e773021089a48362d5355f2. 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/SERLE9805030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6224d6e65ea1223a4876070c2b41683c2be068e4771a58c6c648df768d8c21. 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/NODGN1302050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfadcf884a6de5f0e488ce36a8410072dd71154d3fcb2bed56f751753813887d5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SERLE9605020.