Brita Koivunen (married name: Brita Koivunen-Einiö; 31 August 1931 – 12 April 2014) was a Finnish schlager singer. Some of her most famous songs include "Suklaasydän", "Sävel rakkauden" and "Mamma, tu
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 0x6a197b0cd9e366478d1538319495f34a0a8174a16998046805eb96cf53e5356a. 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/ab8a8776-13b6-423a-ab35-1ee078d58fd5.json and https://artists.proofprofile.net/proofs/artist/ab8a8776-13b6-423a-ab35-1ee078d58fd5.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 0x1aa0820f51cd2568572e81292a960aef2fbadca2970f270956ab00b1071683cd. 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/FIFDP7900300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebfcdc522da4ddcd926d3faa4aecc5fb23baad57e5c42c252c79d653723cf6a. 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/FIFMF9500675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf57a4e0127e685cd17d89ef7d1df8029068d9ca801372bff989c3b8202197e0. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FIFMF8700099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7787dca99c063d8bb82d32ae1bafd4ab073841bfc5127ce2c7d8d91112fa38dd. 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/FIFMF7700156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c328f3c852236653c248137193c069183d3d784a24cc2fd07069f70f2f2b5b4. 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/FIFMF1220819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd14d07181a517b481ff2291e54fa798c64fd7815f5a2e3e5930b1e18bea38df. 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/FIWMA0700879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa0820f51cd2568572e81292a960aef2fbadca2970f270956ab00b1071683cd. 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/FIFDP7900300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b50ff1732707c5fd395e563ae5909abb47d323d7838662fb53a0d82c5b3473e. 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/FIWMA0700523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c4d5ca8c239cee7db6bff557ddd59efcc0146a7c3a09c2e7abe54e2799a1c7. 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/FIWNA1000758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453e9a3327db176fb47c3be99b3d5115ead616bc88c4e4ff9537bf371c30a9f4. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/FIWMA0800690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3396bff2c486d9c92234f7f45f94e033fa0f7b3094d229dc36a8b549863db28c. 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/FIFMF7900016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11791963a91df77e41fe1625d65e7448c08708071d2fec3df3f649539ad910c. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/FIFPS7900034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2618f0c9659407ceb1f2384f94ddfdf375398fa281f5fd7622fce7fcff2231. 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/FIFMF7100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a1307986e8371bc769152c5102fa331dadb544fd66726ee8591106e1c0b472. 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/FIWMA0400572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7e4eef55bf8615668ef8702b6ae0fd7be2485e624734d82c2a1a4890e54340. 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/FIWMA1000764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c4d5ca8c239cee7db6bff557ddd59efcc0146a7c3a09c2e7abe54e2799a1c7. 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/FIWNA1000758.
Ann Christine, Georg Dolivo, Johnny ja Brita Koivunen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72106b23e17e9bfc13351c636f252f890706bea321b8afe794f2abdc8b4e473. 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/FIFMF1238434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf53606549722ea19f7cc1021768d97a9a227cd74f38ebbc2b1212503470b7b1. 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/FIFMF1238436.
Brita Koivunen, Seija Karpiomaa, Annikki Tähti ja Vieno Kekkonen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57622817c485315b71609044b15bad507e7e2e657c264118969d4f88c6c04c1c. 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/FIVLM6201322.