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 0x3c22fb6f97615748914f7b61961a9e02d42aa6dd88db0adfd7117c8590be6d7b. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2f46d5a6-e4d6-4bc1-aa58-745ce5b5d6fa.json and https://artists.proofprofile.net/proofs/artist/2f46d5a6-e4d6-4bc1-aa58-745ce5b5d6fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Khovanshchina / Act 2: "Knjaz'ja, smiri vas gnev"
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 0x5586ee999c24fa94f67c38c578bd6049ecb53c35798f518da01d6e47e60b3d95. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA509005417.
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: "Pozdno vecerom sidela"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75e233a9b69ce8b24f74b5c01121d294ac3bd02c8dcedcd743a4ade1d5c2bd9. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA509005433.
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.
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 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 2: "A my bez dokladu, knaz' vot kak!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ef36e3545c87c71af0c8da25b15114587b3a62f6cbcdc71464c5f88efc0195. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLA509005416.
Khovanshchina / Act 2: "Pobedichom, pobedichom, posramichom"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdaff07b4f24f620623b24917b3f44cb304d5f7b7cb80f65ec665bbda91e88b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLA509005418.
Khovanshchina / Act 2: "Knjaze, knjaze!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e07fb8898a7255b44f5cf096312c3842fbdd87ef6009d5c777266166ed7296a. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLA509005419.
Khovanshchina / Act 4: "Vozle recki na luzocke"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe39e2e3a9a854442a3c96e0c423cecab2d383b114b33197496a3eca558b80d3. 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/NLA509005432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a09064d350a0747a95d319a495a3241608f459f8d6b417464663cf5c0eb545e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLA509005435.
Prince Igor - Mariinsky Theatre Edition - Act 1: No. 10 Aria: "Zdorov-li knjaz"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572abe307bbbe859804b3f99a14466cc62f7390da48bf7dea4835c10929aa955. 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/NLA509312219.
Prince Igor - Mariinsky Theatre Edition - Act 1: "O net, net, drug"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07cb2ddc92ff732669e4c16b5735ab4204c3b7d6807f6bf95872a4ac72a6516. 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/NLA509312220.
Prince Igor - Mariinsky Theatre Edition - Act 1: No. 11 Recitative: "Gej! Plennic privesti sjuda"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e849bb8bb4100644875670e633fc0630d5dc6c5d68d50f6c182b56f4d1581f2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLA509312221.
Prince Igor - Mariinsky Theatre Edition - Act 1: No. 12 Polovtsian Dances and Chorus: "Uletaj na kryl'jach vetra"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb4d6102b2e494726735873cc1ca7fc6549bb1328b8e8c7f25a72bef43f5ee7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLA509312222.