Yaki-Da were a Swedish pop group consisting of singers Marie Knutsen and Linda Schönberg. They were put together by Ace of Base band member and producer Jonas "Joker" Berggren. Berggren produced their
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30120906f08ea978a5665bf0b00289a942f42a4631bdd8ee7c1fcec313a0d00. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48abdee3-d8d1-4100-8890-9c3b1e587812.json and https://artists.proofprofile.net/proofs/artist/48abdee3-d8d1-4100-8890-9c3b1e587812.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21e87ffa48a0b034fc2dcb3237e3e7a90a885f561dfb4d3de52d4f0e9ec565e. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/DEF089402560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f458e6b053334b238bf8c850630d6dbabcb60b796784d66d7fa77942c190c50. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T03:14:49Z), 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/SEVJH1001301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d34ceab664c4787edde7feade5ba2c187b05e8cb02ddf1a264b7f6aa4c83fd. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T02:11:55Z), 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/SEVJH1001304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a52f0380df1bf438f8cd8ea1631245c120f85406b477261b7e4046a9948dc4b. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/SEVJH1001306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84dbec55fa8ab05c71a795abead3c633cbc2a47f313d8641b498a506850fc62. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/SEVJH1001308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b47667380b8553cd848f942e292497b38100d8c44ebba4034a270f3496c71b. 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/DEF089403920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5a269dd9a1909bd9095c454969da7e7b7ed585707c7ea9080d251a51cd962f. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/SEVJH0801611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7579363c0790c2febecdec0df6d1266dbaa459e4eb34047db1867bd7e2215a. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:00:11Z), 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/DEF089500001.