thumb|Nina Persson at Stockholm Pride-festival, July 2009. Nina Elisabet Persson (; born 6 September 1974) is the lead singer and lyricist for the Swedish rock band The Cardigans. She also has worked
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 0x294aec19f1878a24a70717a0ea902e66f0558c731c8dc3bb65f4d0d4ca506fee. 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/73d24f39-8a5c-4281-96e3-df459055de54.json and https://artists.proofprofile.net/proofs/artist/73d24f39-8a5c-4281-96e3-df459055de54.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 0xe198e2709d2d77546e6765c5d0073afa9728515bb8cfd0a80791b4dc62b12ec5. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/SEVUE1802001.
Daddy's Gone (feat. Mark Linkous & Nina Persson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7fc261426ff51927bade9c780826b5631f61bfa2b196e06b170a4a02ae28dc. 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/GBAYE1000511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3175d6ea200bf303befa3f1de96b7bd2672c43d0275c9a9e929d66c295e9736. 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/SELBD0500303.
Your Love Alone Is Not Enough (feat. Nina Persson) - Remastered
Send Away the Tigers: 10 Year Collectors Edition
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91a9728b3d6be2c5267afe758a59e13c639236a023b1253c0e921bcac2c89f6. 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/GBARL1700105.
Your Love Alone Is Not Enough (feat. Nina Persson) - Demo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b70f77406b834d77571e58bce2613e49c3ac01f718363f0298b7d04536b105. 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/GBARL1700116.
Your Love Alone Is Not Enough (feat. Nina Persson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6321e626190e0228aea265f4ba775d1f35c4d25a2c306bd3214b0ec153de13a2. 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/GBARL0700052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c187b23cbb6232010ff75b8e3f7a1ec445be793bf9c17654017ee38a314ae69. 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/GBAHS1100086.
National sånger (Hymner från vågen och Epas Torg)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25003db03aa1a45e110e0adfd6f2331ce2bf30e4568deb48ada1d3432c15fa6. 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/SEVQJ0200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3690453e0a5c50cb7a5552a916d4723a3b179c340867cdb8bd69dd8a076b20. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/SEVUE1800604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485a204022fdeb68373293316183a74b9599c0a1a6c5ce7fba60e2a021656e77. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/SEVUE1802101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3adfb8e93241b5096c60398d3788621722b767d2eaa697ca4de2b930702c75ba. 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/SE2EV1000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29957bee5ff8dac32c6d289fa9b5796f0212e3ff43711d65a6786fbcc3cdbf8c. 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/SEAMA0700168.