Seminaarinmäen mieslaulajat (literally translated as "Men's Choir of Seminaarinmäki"), better known as Semmarit, is a male choir from Jyväskylä, Finland. Formed in 1989, the group is known for singing
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 0xa93f622ae7320044f6965607a2ad5966a53fe1f67e0faae99c5ced996402af20. 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/a6d7bdec-32c8-485a-832d-e438cb827047.json and https://artists.proofprofile.net/proofs/artist/a6d7bdec-32c8-485a-832d-e438cb827047.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 0x3bdea38cb63c39d6932249f7334acd6048a0e01af4479c40ff4957d0f373db56. 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/FI9PF2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc395930db8fa8e6c42ad71f118a89719fe747cd61b53159f765d8ccef3fbb674. 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/FI9PF2200054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8f04dd241e00fd8870b67427a4fc3031b02735d03b1141e10d6d8f8e3733f6. 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/FIN2V1700023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e00b03c2d3e949714c2abf936804841b0f76bcfc861e413e082172cd9e1917. 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/FI9PF2200055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d68cd73d03b8899b506aaaff296f3dd815935ed3ea32c9b42f53efb3f63b9fa. 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/FI9PF2200056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f7dbc15f6aacfb39d1ff43dddd5451db56b026e2ce55312d63acf0a068f6f5. 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/FIN2V1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a537687d503b7d0da8db8933ac661c7a4826b11bce3f99723a2b086d5b0c29a. 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/FIMUK1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8b86172d525b31476829bccb283bd198f2b200a9ae0e21e3cd7f051204d900. 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/FIMUK1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8b78fcb346a0372333b2dded0a498c702836e4e16cd9de4276ad85c621cac5. 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/FIMUK1500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0884ed12b8ee3886ce1ad83d3510e45e6612780c0412e3575542d46e7577b13f. 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/FIMUK1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c64ac437ae6e4fa5959423d824da9c80dab1e6cc7b10e034528b9c40432487c. 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/FIMUK1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6a407f5220c0dab9df63ee7765969dc8cd7a42808689f28b90c8b444e580c7. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:31:30Z), 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/FIMUK1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f20687b6a83bcc662dbb971162ce069ca968fb37a1aa98a8b97a3538ade592. 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/FIMUK1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffb04b1c32db03e006626c3af5d29926de8faac0f06ce1daeea852bbece97566. 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/FIMUK1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cda89af41ded0a860987c1fa478132e99651ac31d0337b2ae45630d0143219. 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/FIMUK1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c192bd2cc4567d168f1c47c29b8814d0b0cf93fee10965061803120adde10d. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:05:27Z), 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/FIMUK1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358b3a8469703547cc1f7c7f36273b416ab5f09af277b20d67576e80dcfe0645. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:09:51Z), 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/FIMUK1300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e7e3717a863951a8ad65afd5f53f58f54a1419dcae7b57a7f813584081dcaa. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FIMUK1300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096cd189358837b388d3957cce58ade5e1b2ac55236e8d2407e0fe3bb2d2049c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:22:05Z), 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/FIMUK0700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615979bf9662a5f3159799e248fa5ee1d3f121b46d42bfadc682296f49957b32. 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/FIMUK0700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ee9dc2826f8b9952e31f5941fcd60a645516073c8931025d11d8478dee52e6. 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/FIMUK0700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79929ff33901073f69313f7432d9fce7ffa2532377ff04aa15d489e542c5394c. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/FIMUK0700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4524529c280e9cf753db95a51ae812e1b9c24d85f1ae3905ce355f07293cae40. 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/FIMUK0400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f71f9093610a20ca224e02fb3ea3ffd85463211f5443bb527ac8c2a7749054. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FIMUK0400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24015f1451d857758dfd5b138dfcc330e7f0f5c14f171efc8b0b78e021bf332f. 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/FIMUK0200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5ba9a569fdb7606d96f2e6e2db896aa9c360c07a857ba9fcce683413a08d5b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:53:16Z), 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/FIMUK0400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01e5efafeb1a79d692ac1f92f058095cfa59a6ac41221aaebcd49643e37590a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FIMUK0400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4695c3e4a3cc370f8222afdb49b867f5b817c70ea5167755b615c342adcea649. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FIMUK0400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c94874cb808c2aeb5f26df4de111e78b87d8446703c1ab4fc0ff36003d505b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:31:43Z), 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/FIMUK0400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682d7cc9b05b310d8c09f26d948891e06b707614a2c46c5201ec97391a4b3b6f. 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/FIMUF9600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f0614bcdffe40e6444abf65d7e15221e5f0ec55b963a062686b4f3714bc472. 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/FIMUF9600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2dc3cf312dbcfb5873f14039c199b8aa40d2cd5cceb27db00130f2ce513240. 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/FIMUF9600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d053208075de48aae2d0a41af50575b1699eaf5ae694dee08ea27bf1ff272e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FIMUF9600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3097224ec858b4c79f9ccaebbb47a18e14c5f259b6bf0b3e4a9b89e56ac06407. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FIMUF9600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c68f70ea87c52edc617cd106fad0fc38e6ad653aa899948ac8a999b2b2c6e9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FIMUF9600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612366623860436846cbc1dda7ec0bc0ecedc8c246f018564304b58e6aff4cb8. 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/FIMUK2500005.