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 0x75575f9f90d316199f8c019515f777b2314de2f3e17ba65a3e00f73bec795aca. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/489b852f-552b-44eb-b9d6-cfc7bde0a51e.json and https://artists.proofprofile.net/proofs/artist/489b852f-552b-44eb-b9d6-cfc7bde0a51e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rachmaninoff: Liturgy of St. John Crysostom - Concerto for Choir
Mikhail Ippolitov-Ivanov: Vespers - Liturgy of St. John Chrysostom
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 0xd28a53cdb8645cde720033d2cb69ef556fbba7c70c5776f6e783d768760ae3f8. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/DEB331243601.
Selections from Medieval Russian Vocal Art
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b71ac4f5824d5017fc505099d614c8a3c4e8958a73ff579e9ee6137bd2eba50. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DEB330695702.
Structure of the Mass - The Evolution from 14th to 20th Century
Sergei Rachmaninov: Liturgy of St. John Chrysostom, Op. 31
Mikhail Ippolitov-Ivanov: Liturgy of St. John Chrysostom, Op. 37 and Vespers, Op. 43
Hymn for Lent for Male Choir: Tebe Odeyushchagosia svetom (Thou who Art Clothed In Light)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec30447ced5a3dd22ea8acd5da9fb8904b83c877b85dead34b6b3e3b2f0c32f1. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/DEB790302027.
Byzantine Liturgy for Male Choir: Dostoino est (It Is Worthy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2400d25c94aef14a1a79f1aa14ac4b8082e0203cec28a9551dc3b540df076338. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/DEB790302028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441ea8f012faa5749e7ac80d57b8c360e643502bbb0cb2af24b33e0d7094cc3b. 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/DEB790302029.
Liturgy for Male Choir: Vo tsarstvii Tvoem (In Thy Kingdom)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf62fba036c2f30fb457d23ad04e44ab4b7c06e4ab28b19bf1b0d9f54384494c. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEB790302030.
Serbian Liturgy for Male Choir: Izhe kheruvimy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee61d142d877276990cb82aa9d298e5b9f550977f4aa83015690cec0efcb31da. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/DEB790302031.
Liturgy for Male Choir: Dostoino i pravedno est (It Is Meet and Worthy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7334f868fa5e124eeecbbe088bbf972fd5d45f01d6655525e62ed12e9ace09b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEB790302032.
Velikoe Slavoslovie - Serbian Greater Doxology for Male Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651b42f2ad06b2389597e7df84d192f3c7755b4a0985218289ba668e93979c64. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEB790302033.
Arkhangelskii glas vopiem (Hymn for the Birth of the Virgin) for Female Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1806bef3afa4fc20c29184639e5bcb5295abf3884448ef5edcc7b7f27dbb1a4a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEB790302034.
Hymn for the Annunciation for Female Choir: Sovet predvechnyi (Harmony Everlasting)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff512d6af2c4e2b56d528cf9327b4bab76385064e1c6cdd4ef8fc83f6ec927e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEB790302035.
Eight-part Hymn for Mixed Choir: Voshel esi vo Tserkov
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d8a39cb0661372ba0dc4dce95d911e0bfd2979c9b47d96b195ea8656bab973a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEB790302045.
Chant for Male Choir: Blagosloven esi, Gospodi, Znamenny
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa795f7d9e0011e8ee297fcd795a7dfd7033981d44c868652d1ab7802016f1a5c. 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/DEB790302046.
We Glorify You with Love - Songs to the Virgin Mary
Today The Virgin Gives Birth To Him Who Is Above All Being
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61704b85cbf67c55a54e2171a28e37c491572f1e0ae5cf472dd665e3c64e938f. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEB790302235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f075b027833b8a5abf7b8a82aa3af4f90d1173465ee3e41babc618cc77c60f0. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DEBL61044266.
All Night Vigil, Op. 37 (Excerpt) No.7 Bogoroditse, Devo, raduisya
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9119d16edb5c8065cd43e50b66d39bce19bd7732018038a00ab7a2edca4b82a1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEBL61044279.
Now the Heavenly Powers Deal Invisibly With Us
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f67c9d9c5c2ccaeaff6c1ad7e29f4b264715f4442667a6568e1b7e3463b98b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEBL61051626.