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 0x644b771e8841da38692358af71762879e284ce9cf27decc08c15ee409c30f423. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/41ed7db5-e42a-47ea-a3b0-97f88e542923.json and https://artists.proofprofile.net/proofs/artist/41ed7db5-e42a-47ea-a3b0-97f88e542923.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 0x6f9339ffd83070133f4b1277258b176f5448cee8842fe884f13469b6f8c488ef. 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/QMDA61425125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25779ea394ca81ca1af58ac051b35d20286359a426cb9aa9005151d279c222c7. 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/QMDA61425128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fdff5f7ad8c87cb0fc2d2168235b0a23cf97b9a72a57bd8b63f398518d798e. 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/QMDA61425133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3e3c24a872bb67dc181eb71c96be37435781c8ff4ff3e15ce7213a892b0775. 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/QMDA61425134.
Stabat Mater: XI. Duetto - A Tempo Guisto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9aaef0e322afb024bff957f3978e09e60778e5137650bc141cdc439f4e1744. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QMDA61425135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba34580c7a10e28889fa4f596568f2a06ed8c087c081b38ea0e1bed10e1f3c0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA61425143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6195a97b1adfb343a20647699073e3a2883c8e154f986307ba2b29d3d3f0fd95. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QMDA61425145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5d7994ccda2b246cc16d7c01c6be612bf5ba646a4a743c877c74fcb263d840. 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/QMDA61425151.
Stabat Mater: II. Aria - Andante amoroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0195eacf5ced9d5467b9e7f4aa3f8069cccf9bd6c92c3adb13d84ad24270f244. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QMDA61425126.
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 0xe87f18ddcc4bda029d1d54b57758e7ec3129d7299954ce8abf37e431dff9e459. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QMDA61425127.
Stabat Mater: XVII. Duetto - Largo Assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600d6b65d1a59cb9e77eab3eaf78e544025e8d008362766ba3d8f64d9afb09a7. 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/QMDA61425141.
Stabat Mater: XVIII. Amen - Duetto - Presto Assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360ccd61f5e50bd81f11aabf24d1338a56c270060214eeab9c7c59767ec9d216. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QMDA61425142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3b3997b56e4d0d891f7e86b83ae23598d0bb28a6fc9e06e92388e566aea5ab. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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/QMDA61425144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f986e69fe69b7da69515576d20a5b1832e284c3528c00e6cfee5baa10e3f85d. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QMDA61425146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd995fa0e590f58f471f3e30a59e3d0eb77ac760bc3d0ca718ac3a6572aa74e92. 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/QMDA61425150.