The Male Choir of Valaam Singing Culture Institute
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 0x0b7faef501ea69be973ab0a4bbc764f9ae4d5d222d6df35fd91618b17577f3b6. 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/46839bab-de92-4b1a-8b2a-838b3084d874.json and https://artists.proofprofile.net/proofs/artist/46839bab-de92-4b1a-8b2a-838b3084d874.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Legendary City of Sevastopol: Russian Soldier's Songs of the Crimean War (1853-1856)
Canticles from the Time of Peter the Great
Songs & Marches of the Russian Imperial Army
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 0xaec2c7240f646e99cddcce6bd670b0d307c38c03fd70f039f0c47c2591324f39. 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/CZH401105528.
Warrior's Hymns & Songs of Russian Empire
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ac8f8b85ccf0703868ac64ff34d5b017200e0cbb8895d5b9d585f4d18168fa. 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/USA371667404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678d2f9bafa353a399e88042d8142c201dfda027ca58d268e04ad7fe2fcbe9ac. 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/USA371667408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8011aff5b9b6848640802cda2ffd9318b1aaa846625c7e7af8651d69f8c206a. 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/USA371667410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb23faf2907487d8eb61e4f2a4ad15f5ef0c260bea56f16e712f1bd6e915cca. 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/USA371667417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a6d8c077c222269366e5c2f73e11c929aa94e8d8053c5957b40caeb8642b898. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USA371667418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80500cb1b47b438e448cb659f56bc9d4ae6e67b752875e447b3faab6247ecd5. 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/USA371667419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf221daf03212ee3763781fd6d7d0987cbf75c218fce479eee34149d884b53c. 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/USA371667421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff526c4cd8ddea3a51288d9b987974563cd798deaa6dbfb4e6950bd284e3d07e. 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/USA371584965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bb3b5dbf12799fd254d0fb4d40dffe007d24b5ffb01b7451dc5abc0dff5eed. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USA371577093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7355301e17231bc10caaf3c44af48174b7a63d35a1ddb3fc79f9fa12cc23cab3. 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/CZH401105166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8feda151dd3fbbcb0969a8cd3256596407720cde28d9b68aeda33c2b8565ff1. 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/USA371643959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ed016837439f89652da5ac0542ecb3823855334ab75c1267a822e6ce5f28e0. 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/USA371643969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7825940dd91c3ad1d95e44b0491dd86ce4f677c81687f542146a9705480a26ee. 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/USA371643970.