220px|thumb|right|Jakob Karlberg Jakob Karlberg (born 13 September 1994 in Alingsås) is a Swedish singer. In 2015 he signed with Sony Music, releasing the song "Fan va bra". The song peaked at number
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 0x969e54620dc5e76d77059db26821fb97a7d52178fe7c3b1f7b46e1162cfcf8f0. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5bf97d95-eab9-4997-ae06-60e65db82a71.json and https://artists.proofprofile.net/proofs/artist/5bf97d95-eab9-4997-ae06-60e65db82a71.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 0x34fa9e83f732837426595f9193fcd4803c69481b906877fe5652b9f1684014fb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE3GO2106901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a4475843925459aa7b84611694a46e05ea5ca4b30162b4dcee70b856d9e988. 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/SE5XG2501125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35fefaf54e02645a16d7b95cc54193aacdf73046fab2538391ec631bb910baa2. 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/USA2P2419527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e24a410494a3cd8cd659b4a56c99b1b2142a60c8e09287141d8b38df57c7fb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA2P2428084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e2ee0151b759a94a947d4c8466ef9814b61b35b55cf094a8ba96c49b213da1. 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/USA2P2249781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc1bc970a16a71668723688601c23bafe7b7207e95e8e9a376d063ac4882e66. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USA2P2230461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c2a3183c4bafe14e16bdf5ca2807c8393e317a3b492627c2af1f9e9dd6d8ef. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE3GO2023401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e7569e3f0803310b38ff7831f13375d18846ab036e83023b20abf021f2520f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE6LB2000201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4bb1cd82a8272f524eabd5837e7eb8b35a955b91dcf6813cfeee2fa9b364bde. 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/SEBGA1700190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2732686fb6c3f30cfb51a46c11d69308a4782e76238d3004f3d480ba141c0c0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SEBGA1600680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b15155e8d0944cd77cb9d2cd9597865adf5d8c327932b4625c8a12a8b6f7f4. 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/SEBGA1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412a82ab806a8a3788d5f7a073753459d06bc317133f8c6b447ec9f2bf227c13. 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/SEBGA1500207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68895e6e45abe6fc26001b67524a9b166a790e48f58a980c21a4d85d245effb3. 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/SEBGA1500100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af9b93bc81b696b753e21a6c467894b73e38fa6d16a5ec4a09c529ce2b7f271. 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/SEBGA2500559.