Jón Þór "Jónsi" Birgisson (; born 23 April 1975) is an Icelandic musician; he is the vocalist and multi-instrumentalist for the Icelandic post-rock band Sigur Rós. He is known for his use of a cello b
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 0x5281af0565fd9d7743a492b72a074a465679583d30a6a40b3fb1c7de6fb47bf4. 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/5cb453b7-fd47-48b7-a134-b315cccfd564.json and https://artists.proofprofile.net/proofs/artist/5cb453b7-fd47-48b7-a134-b315cccfd564.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 0x6da1366b2634221f9ec0e0c5fb0a4eaa03edfb6f08db6725c6aca8b65c97d773. 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/NLRD52250367.
Salt Licorice (with Robyn) [Thomas Gold Remix]
F*CK U SKRILLEX YOU THINK UR ANDY WARHOL BUT UR NOT!! <3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00ea1c9417a4306eb0e64983d80827b2a45c19f6771e2e4d5eedb4f06228a58. 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/USAT22501800.
Never Forget, the Album (Iceland Eurovision 2012)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6dfebe4abf1bdae720c9eb192cde6ae6dac07f3bfca08fc7ab27a4bae4161e0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCABG1202587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85ca0a544c54fcdd3a4099e1bff2b17703df567770911ae5e1a50588ad73c2f. 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/TCABG1202592.
Kaleidoscope (feat. Jónsi) - Ferry Corsten Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefde396dbfb9e9a21d0e2563558aa52d1040452328a980798fa5198285bf9dfd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US7FE1000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb63d29192c1edcc4076c84f11c8458b3e80159d7c5fcdc8054cfb85819df7ff. 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/BEP010900165.
Watch the Sound With Mark Ronson (Apple TV+ Original Series Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931f425f655b5551815314dc2204d080feebad6fc7f9449c419486d6da74a5f3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBARL2101198.
How To Train Your Dragon: The Hidden World (The Deluxe Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a02d9e71eca17adf70f63aaad22736fa9abfc757b32b02fcccae40747f44d16. 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/USQ4E2204514.
Together From Afar (How To Train Your Dragon: The Hidden World) (6m24s)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ac8b2d1ed63877d8cc5adb9342de153fdc1b052681f8bb8bb2767270af0302. 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/USQ4E2204520.
How to Train Your Dragon 2 (Music from the Motion Picture) [The Deluxe Edition]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f0a419308f759c516bfcc3d816097c070a9138002a97cd52fca590f88422c4. 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/USQ4E2101363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc05dd52558d8a1626ec1e134e3f25fd46d5d9c6b4126e8a635d6224b1b055d. 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/USQ4E2101394.