Värttinä (, meaning "spindle") is a Finnish folk music band that started as a project by Sari and Mari Kaasinen in 1983 in the village of Rääkkylä, in Karelia, the southeastern region of Finland. Many
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 0x8dbbc88fc4957550a4862e348d3e11a73668d18415c2d64babb8d9a95e71c291. 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/26d1e843-9b9e-45ec-ab3f-bfe793ef2132.json and https://artists.proofprofile.net/proofs/artist/26d1e843-9b9e-45ec-ab3f-bfe793ef2132.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 0x6a3b53e4928b7e608f70167ca15543e013d40c5ee13a80b2bbc802411486d802. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/FIPFS9100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580d653434144fd072b2b490c689c9cb81812598ca41d34139aacaaa0106c9e0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FIPFS9100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e99966d8ffa912f41141f53b5d8594b7c5d4c8c4d037a02cba554ad3d27339. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T16:05:08Z), 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/FIPFS9100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4befb5a624c6f39b9a5ab492b18f95395ad6f0e4f94ce5ec074e95e59fe017f4. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FIPFS9100109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fa1b2547eb95864afd40f6954d013873c9b23f36bd1af4019fa7a4e94444f7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FIPFS9100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e55fc84ccb1799e9fbaf0f0c292b5d4d68b8a03e26398ed31fe91cc2a47064. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/FIPFS9200301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392c190c95726796db03c0c47712201be06f5f4ba07716b33a906af1a1e312c3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FIPFS9200303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfbdbb048a91dd40f06696a71e56eaa7c57bb6834a9af63347c797f6e9e340e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FIPFS9200304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c196a495967b35c6a4ce4a9465e82f518bd123cb55a889e6396c11d613df0e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FIPFS9200305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e55fc84ccb1799e9fbaf0f0c292b5d4d68b8a03e26398ed31fe91cc2a47064. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/FIPFS9200301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6326d1b13b89e45c569e2e4568775274c5e92be95a40bc0e49f4eccb7ca7eaaa. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/FIMAY9400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef326cace457a4412c6a7884ab6c140968b7d9a51c7a43f351f8cf417c09761. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/FIMAY9400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078d942a7a7d1a1d8a4c7abcfe2cef1260cf69ce07040658a0569d28b84c6292. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T23:59:43Z), 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/USBC19801408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a40cd242c9b6e937a9fb7a2839b3454e807b3d5ad4a722017a6d647eee28275. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T16:10:57Z), 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/USBC19801416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa36a7eb85849d532242557d5cbc752bd9cf53cedffd48e20c264052f6f86b0. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/USBC19801410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd239c6dac087f08d48af185372aa46f19f5b32e767e21d4f664ea0b871e585. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USBC10000231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8e712e1272d3829162a53f5547db17e5655f7148e78bc4a548eea7811da594. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USBC10000233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32166b97ea7935eacd589fa73b89244a687269a692cfa561b0158a0ed810f73. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USBC10000235.
Tuuterin tyttäret | The Girls from Tuuteri
Tuuterin Tyttäret (The Girls from Tuuteri)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa151e13c1059d795f77336b4ed7a4f789d1442442b9dcb3c0c494d0c325638e0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FIZEN1100057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8680e8191794ef41c4cc6a2326bac62d7a9041cdab2b4562ae1a0deecfa65373. 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/FIZEN1100058.
Tuuterin Tyttäret | the Girls from Tuuteri
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d2099a337d6df6114002403c99ed8d31cec3bec4c44af416937b0273e696ce. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:22:42Z), 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/FIV3M1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d14d30c83685b724f763aa6fe1a33d8051c94c065380e9b016a8a8cb5970168. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:25:15Z), 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/FICBF2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9c3fb93421d753be053e58c7607b180452e0bf7243baa377970b3d3f972705. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/FIZEN2400024.