Sonya Elisabet Hedenbratt Bolin (4 March 1931 – 5 April 2001) was a Swedish singer and actress. She was considered one of the foremost female jazz singers in Sweden. Hedenbratt's breakthrough as a ja
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 0x7be8aa5b30bffeffb597c2e7dd5a69623e6a3b2ed2f4a5ba86f63895519cfc93. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/98d05bda-20bf-43b8-a171-a21b0cf8d1e9.json and https://artists.proofprofile.net/proofs/artist/98d05bda-20bf-43b8-a171-a21b0cf8d1e9.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 0x0b002d4545542bfd5bbc134463e8572c1ae77c14361fa453345681885db4a11e. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:56:49Z), 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/SEPVI9225010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6793f19e1f99234a12849267d712b2992b76c5cb6c52113f79f0576de7c4fd9. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T20:01:07Z), 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/SEVGT6709106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e45025d3c23b9defccc21b32369c5ca4b7618e527dece239c06be594a7a30e. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/SEVGT6709108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc451c65dce07523d2777ff74e6afdc08aa407600dd8f88e16ee87bcccaec2e24. 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/SEVCE1100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de6f35ad7b1d8f7f23eecc4208328089bd3912f1b2443fba08483296fff1b00. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/SEVCE1100201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf965b0a6036d2e56669188d7eb0148eedc8e1c2325005ceb20d34a0725e7a340. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T17:47:35Z), 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/SEVCE1100118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9082a9663a79162a7d505c4c78ac5aac6ae265cadb3b1f21cb8966f48dee22f. 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/SEAGA9918160.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28b65c164b6bc05c0f8c9951c6ea75445df0448b72c82190b85114eefb7eef9. 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/SELJA0100408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1623243d4711079c7bf2b82e94562e5863d12593e27324dcc8bc0f4cd2141f9d. 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/SEAMX0300695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ca50f3ec27f4f8b02ef36be31bd40b302ebec759c4a280c195b5627194ad59. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/SEVNP0300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0681105b9d3357748a4c76e630c7e769e8dae1a72b9904675e2de53c29ff174. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/SEVNP0300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb73a7d15102b507a089ce4d10f6a7775c1f640a9a11ec8a4e7cb95456210a0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/SEAGA9114130.
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 0xb8b285965203058e555890e35cabbf4bd107b2cbee5c1d0efa256dd8a0e3e15c. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/SEAZC6905010.