Fredrik Jonsson (born 28 March 1977) is a retired tennis player from Sweden, who turned professional in 1996.ATP World Tour: Fredrik Jonsson The right-hander reached his career-high singles ranking of
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 0xb80a84549845dbb279ee33d034e522681cb003716c7625b438e63356bbd573cd. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c9c2963a-edf5-49af-8d23-0c782df73221.json and https://artists.proofprofile.net/proofs/artist/c9c2963a-edf5-49af-8d23-0c782df73221.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Anne Sofie von Otter: I Let the Music Speak – The Music of ABBA
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 0x849db2ecd6e82ce5868215c56dceb6d822467c3b279a84d8a06b191802452796. 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/DEN960432902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81d8ac8936cf243646857b061bc7dc8cdaf65a11dc47ee3a8bc98414aceaef9. 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/DEN960432903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf90b357e9d8fc28badf9f860055e26447b0820608a64126b10f0cbcbffeac4b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEN960432905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbbf67c07cb24e10dd97a2453cde5e73e0d52f85d71a0d61fdfabd377454758. 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/DEN960432906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7d5649e86c5abf841675836b56c8ed8aadfe5b739d936bba2194b8d68aae41. 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/DEN960432907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd7a3c2d09628ed39f0a2cdca17e3ae6860503bcdaad0a9f06c3242d966fe61. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DEN960432908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200ec22dce8a6922b3bc0032ffdabfebdad37259da4a4d56ee5db85790c4b98d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEN960432909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf46e849d2ded99655df771e55a89e6eaf51c8ab3067c2f36025665f7a9e4219. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEN960432912.
Someone else's story - Bonus track; E-album
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f5c9a97a3f109e8ee72f3728179b15233e4dd3302e4a59e89475252b6bfa2c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEN960432914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe308a592be828a041e51804415dc9c09b6089d9619fe5bb88c117b52f53f6150. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/SEBAA1201401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390e9a08676b129ea67b3d65a0570be3130102e458d6f9e94517d70be78cb918. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SEBAA1201403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a12e9fe0369af7d1569a106cab5fd80edbbc6b6e3f1e9b267b896fd6c46a69. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/SEBAA1201404.