Mezha is the name of two rivers in Russia: Mezha (Daugava) is a river in Tver Oblast, tributary of the Daugava (Western Dvina). Mezha (Unzha) is a river in the Kostroma Oblast, tributary of the Unzha
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 0xc91f58362d33a4fad7ac77e0dc04ee34e67f420fe3f6ed391c91473fd55daa2e. 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/e6429b31-24bb-4d0d-a5eb-f7df69a94247.json and https://artists.proofprofile.net/proofs/artist/e6429b31-24bb-4d0d-a5eb-f7df69a94247.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 0x728968ce56516b09bad3ab29c23d075b447fd14c930a88bab493ffe2299001d7. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:24:34Z), 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/QZTAS2163229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6555d031a8a1fc969b5fce0a9af26839abcf7e7edc1306e833d62aa02cfd6bdb. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:27:13Z), 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/QZFZ22288356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d83e48a74028d1d41313f38abfa78c5227f27d211ae9d4d0ec568074b958c6. 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/QZHN42267512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e83ebe2436fc4f112484644ea694e8e5edb67d98583f5c09684824b8fd18f2c. 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/QZK6P2298312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfacf45ee09181cecd49bc5ddaced3f216e2bdb937cafb35aefa03a423402d90f. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZMEP2270335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5adc5734f485faec0e04805c4bf0d9816f10df4b47c3c412ecea3f18586c66e. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:33:36Z), 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/QZMEP2296750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafa5c46077ec03050e434606189f3b8181b4be80c033b535af8413e141c11be. 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/QZK6Q2367287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9a3f9df679773b10e1b50a128d1dc9162ff5f0af21216ab6923da0dfd95942. 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/QZK6Q2381983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f46cc389028742592ed5cddd245eb21d157d4a2d2371532895d17946f3845e3. 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/QZK6Q2368142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121af5b0173af9663e5622d3c3536c420c417048e7d124284b467f1cb38b1652. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZRP42399012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad448ac70d7eed9a37aa19b069a1fe6a580f89a1f82174a77241de1f0a364dac. 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/QZHN42482745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132c6b113ca3565ecd2788a7717af743e850241447c165a81577d2f7de386493. 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/QT3F22475441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4b1c1bc785e4268a1cd3d9dd0c89381b2e34ad0616be50693d2942290b6221. 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/US3GD4514770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2541e493f373c542560352d582787c04472fe7f83575012c5d358d9be5d1f8. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZHNB2570515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a546dce3a3133b9c2c0fe8535b703c3c963a4daee83ed763dcd0e8155fdc50e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTAT2582481.