Perho is a municipality of Finland. It is located in the province of Western Finland and is part of the Central Ostrobothnia region. The distance between Perho and the regional center Kokkola is about
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 0x978f6e8ad4c7eeb6edee4817291c6eda48b747d77bb4f56da5ca5e39140c927d. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb328989-aa7d-4e61-bc3f-1832943245ba.json and https://artists.proofprofile.net/proofs/artist/fb328989-aa7d-4e61-bc3f-1832943245ba.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 0x74f2e4ab0d2ac9260ba2eb9b9af4328530ee4a0f6a5264f228a6695c8c651b02. 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/QZZ7W2491166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2fcd1bdf1f55d9edcfafb4d09dd9982e91e5d6cbdc4441070009255eb3f540. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:25:12Z), 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/QZZ7W2491169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b41da8501004b712b1bf390fdcfb838d1807610dd590ded6eb6851feb4469b. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QT3F22459529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c78d18fd076abe8b85421d7604424c88118000fd81e704886ca9db3d0842e4. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZDA42564473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5ae0ac5cf8db2db6974088c43f74f3da1d6230354412fceca757100d4c9f70. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T22:38:27Z), 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/QZDA62507073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f432cc16c7d666d79e328f85d32ddcb7f887b530fcd158cff76e5c3f96a7e59. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZTB32518390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a6b5360c7020e349a2ed925cea8e33c6f51f3522658728329231bc8d9ea16e. 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/QZWFF2554061.