Hellquist is a Swedish surname. Notable people with the surname include: Adolf Hellquist, Swedish diver Carl Gustaf Hellquist (1893–1973), Swedish jurist Elof Hellquist (1864–1933), Swedish scientist
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 0x3c2d2c8232ba69b64636b71a704f368ca882338c7cc7f4a3e15dde07ddfd6b7c. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fdd6259a-219c-408c-a19a-02f5e9be9297.json and https://artists.proofprofile.net/proofs/artist/fdd6259a-219c-408c-a19a-02f5e9be9297.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 0x65d903f1ddb0b7769b80e743c1af03f8d54788abc7773495ddb7fd13b520a106. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/AUZR10700490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b78cccb481ae3d6d9dbdb7fc562e435c8e0c8a94b6e2c2c8fa2a338139c7267. 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/USA2P2039101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5633a5d2c5a43483c96d91d80d16565857e5a30789a10cc758b69fa737763730. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USA2P2509521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4c25350a557ee32b5a5ad6c2407c2164d84dcf42d924fe4f196300b668b6fc. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/USA2P2509522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf75aec1c55f00003f27aeeb34e52f00b76827f53df931ab674b46254be237e3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USA2P2509523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d5f30d6ec4b76934cb1a9949c3af809221e9087bc83ecc39e0b4be9dea0a445. 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/USA2P2509525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fd221584f00175eb26248db6cf32f5fd22442939f3e7f3ef534c683512b9c6. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/USA2P2509526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b4f7e35721908de4d40c54157ad3a1b10d8b2c2b95dfee3b2c5ff2d54c8fdd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USA2P2509528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046d6fdaf2de857bc4cc8d783df24b420d3938070fac2d78b37fc55f0d221a13. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/AUZR10700574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fc727f8368c20c98c38809c8606ae90fa027c22f3352f8fded9f9bf5c75485. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USA2P2223309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c920db1246e52c829084f45ea74a39987d48bf91f7c5123a044ab164c304f4a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USA2P2244827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8da3f7e5dd762b8b2a406c0f61ec9c0648d49ed7d2034acb5169568434efdf4. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/AUZR10700673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e62e86e29e182ceeb1a2f2c81f5caee79b6300131ce00c6bb77dbadf3914e2. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/AUZR10700643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bb141b0040637a5c16e940c76c6e206ce28c6b31c8d8c81ae4262ed240188d. 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/USA2P1828712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6138f235d777288bffc5a41f7060a62361f8941309478a1563cf5d1bba3d1d39. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USQY51789226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ea7e7282c5d259ab4484a554d71e38622a56a00e6b02d199e92cb00eaaa779. 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/AUZR10700439.