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 0x3071d12642c11ed5a6c116217664bd80c5021c3de4722d148003686bda9ed1fb. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d216f9a9-6e22-43c1-b8b2-09f189605537.json and https://artists.proofprofile.net/proofs/artist/d216f9a9-6e22-43c1-b8b2-09f189605537.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Khovanshchina / Act 1: "Och ty, rodnaja matuska Rus'"
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 0x468e5cf9751c7b748a5dcd7697acb30a014002686eff2876e2dd7ea469f8bf73. 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/NLA509005406.
Khovanshchina / Act 1: "Tak, tak, knjaze!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60755d0916cebb6e8c541d042bd1862c0c3224c7654570cb97b97613ee8efbc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLA509005409.
Khovanshchina / Act 3: "Gore nam! Gore!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5971571959580e13f47ff2588204f5d1f390c90842a52de52bf5a4a73830d89. 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/NLA509005430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475d58710555ed796f00d27292c9bd5c1d3380d0bb08d684a90e442ec7e614a8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLA509005431.
Khovanshchina / Act 4: "Gospodi boze moj!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61808b3b59e1a0b65b23b5ae4468d8c81ef41e70a144296bebca3ebc58bbfd5b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLA509005439.
Boris Godounov / Part 1 - Picture 1: Well, what are you waiting for?
Moussorgsky: Boris Godunov (1869 & 1872 Versions)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff07523854dee1eac537751252c513d1673d91742ec9bcd1f5b5d4eb35710502. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLA509701501.
Boris Godounov - Moussorgsky after Pushkin and Karamazin/Version 1872 - Prologue - Picture 1: Well, what are you waiting for?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0d943e924952751504467ff991e810d165b786fab9e91a848c4acaec60620d. 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/NLA509701535.
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
Boris Godounov - Moussorgsky after Pushkin and Karamazin/Version 1872 - Prologue - Picture 1: For whom dost thou forsake us?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7e9087473ba9017b9acef7c4d47c05f094e7ddcdd6e884aeff6bbf6979e285. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLA509701536.
Boris Godounov - Moussorgsky after Pushkin and Karamazin/Version 1872 - Prologue - Picture 1: Glory to thee, our Lord
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffbde6036be88c7abacfe1910fc4f2c004ef3abda4dbbd07f5803305d572dd6. 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/NLA509701538.
Khovanshchina / Act 1: "Podojdu, Pododju.. pod Ivangorod"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20507eed623d8c7e71febb577338ebb6014d75f4181cd6f7a56773b1d0b87b42. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLA509005402.
Khovanshchina / Act 1: "Deti, deti moi!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe267c8fe18acf649bebd00f4b7c18c2b02bdad9fb71b96376f0c23f270668992. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NLA509005407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe091b0c8f65ea1e74197bdd7217cc2e544d02cfa34ea71b1a15a02b1b345e6f5. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLA509005410.
Khovanshchina / Act 3: "Podnimajsja, molodcy!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03d29d45ffc906ccefe4c6b24dd91f2ca7b26d649bc49159736b92e20673241. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NLA509005425.
Khovanshchina / Act 3: "Ach, okajannye propojcy"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c1db43d62323cdd70713ca740eddda0d7b8abb19ed772626603d51e53e048b. 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/NLA509005426.
Khovanshchina / Act 3: "Och, mne nevmogotu, och, vot"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee22fdceb92b7cd55724d379182dbd037d29c3a7e2c16c63b78073cba048efa. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLA509005427.
Khovanshchina / Act 3: "Beda, beda... ach, zlesjsaja!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9decb606f8b57f1e158169cebf797a18cab133b88a2999ad76a8e0ad3b533d49. 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/NLA509005428.
Khovanshchina / Act 3: "V Kitaj-gorode byl ja na rabote"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed84e3e4f36cf5f03a2a9801059115aaf64d7f69d8db588752d3ebb8f669a01. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NLA509005429.