Sven-Erik Bäck (16 September 1919 – 10 January 1994) was a Swedish composer of classical music. He was born in Stockholm. Bäck studied from 1939 until 1943 in the King's Music-Academy and from 1940 u
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 0xc075ba8e86eeee8bf220eac0ed721d47504d560b8d0b292a4c02c21d2b3cdaca. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8d42798-711d-472f-92fe-dfffd6535585.json and https://artists.proofprofile.net/proofs/artist/f8d42798-711d-472f-92fe-dfffd6535585.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 0xbc5626b2e0bdfa4014955c0feb753939ff5d09f15c461c91e3a54299c19106b4. 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/SEBAA1204601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47e211b4825257a2f674c4f9694837ce722dfe4e89116d7d48b41448b3c88e1. 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/SEBAA1204602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb79b389e322ae0266f050759391d16c85d03747042448def56fc0e2250a0ed2. 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/SEBAA1204603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13799361fab7c61ccb5a33e0a5976b5f6c69ff7f84dcf10c78a5ba6799b39fd7. 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/SEBAA1204604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2870fb65b6d51cd34ef4add39e5fc5145e69a03e3eda7d23738ddff05d323d9b. 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/SEBAA1204605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730b0d1aade2aa65667aea6d90fdbce1f6558874a8a16f010ecd2ebfef4ddb24. 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/SEBAA1204606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4472f0915aef9a9f3056b90a95213be9454e7208b20dc048c94a2aaf61d84060. 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/SEBAA1205201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02aa75017aebf9c448029fffa1dda6a4579b5fc508b08132d9d61ab7b816f764. 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/SEBAA1205202.
Sven-Erik Bäck: 100 Year Anniversary Collection
Sven-Erik Bäck: At the Outermost Edge of the Sea & Signos