Ulf Sigfrid "Uffe" Larsson (1 July 1956 – 28 September 2009) was a Swedish actor, revue artist, comedian and stage director. Ulf Larsson was born in Bromma, Stockholm, in 1956. In the early 1980s, he
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 0x967bcd8bd9dd2b1676ada09c87feabb005d936a0adeef4018ce47a6899a3e0b9. 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/cbe92cea-16e1-4a8e-8fdb-3f156ddd2373.json and https://artists.proofprofile.net/proofs/artist/cbe92cea-16e1-4a8e-8fdb-3f156ddd2373.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 0x66d814dc466dc785d82abf3e030fcb7463b5186f3b3e9f024efc776f610398a6. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/SEBMA1600742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8716877eb82d2d52e03ecf215e67040cb9de3c66ba2291e2c314c3da8cdbfb80. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/SEBMA1600743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b82b2dfd231e5b000d53ba33a617d92f8bbcd9791ed6baffbe0ac7de0440389. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/SEBMA1600745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb008c829fd6d7cf26904f2dea38519ccf5e4812d92b89285cfa0141f7f29b4e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/SEBMA1600747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5bc879cde7d040147bd6927e02d2c36fae3c1dd280756f30daedb4d43ef716. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/SEBGA1601652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823abd91da3472e6fd0cb51f0a320f5ddaf740d4f32e34977ced3034d002188c. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/SEBGA1601653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5bb4103b7e5e7b3f1a6d0cc52990d1525bb0addf9866bfe5cc177d53f4fb418. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/SEBGA1601655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa254b929d247ae27ec191cbfdc41161ea6d573d02951d4c09df44a436b8fe406. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/SEBGA1601656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc461a3517a6051f958e1b9d72df4c2725e3891a62fa7821857e59bc450a6e1e2. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/SEBGA1601661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69701b1b701b5808ea6a8343f1af12f97c6ee186d3caadc7f08544a4e8dcff04. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/SEBGA1601662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb76305b967aabf69c311306035dc550807c19dd547cde2690fa3b7738007da. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/SEBGA1601665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a045f5cab35cf2a4eeafc59e7087b9dbf9bb83f521bed155a547ba39c5b6c84. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/SEBGA1601666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e56282b8a5d5470963f985978a2047df94cd6d2802bd0612ce27dbf5c02e2c3. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/SEBGA1601667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a71517a0d2db84eecb9300f31562275cd0047c45995a249a8c62115dc26f0f7. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/SEBGA1601669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f7b8f06c887f0c5829b8995ad64c995cbb9213366b2ae802c9487820009164. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SEAGA8908090.
Det ska nog bli män av er nu - Från "Mulan"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5ab1024c1634e714ea458f168ff5b77c333404cb1786ac119f7f430bdd4843. 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/USWD10731920.