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 0x4ed775ff6b168973a0ebc70e7c3fe22f0de28e3ceb6d3f8c2b24e1353c0be733. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8a8584e-4d83-4ed2-a434-6bbb30b230a2.json and https://artists.proofprofile.net/proofs/artist/a8a8584e-4d83-4ed2-a434-6bbb30b230a2.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 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 0x433bed6e3267c4c1ce03b8b870713024e2a29745ff5ba486c91c188b9395bd0d. 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/HKI190114901.
Stabat Mater, Op. 58, B. 71: Quis est homo?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cbc025fe2200acd3b68f0b8da917205ef1de6d8b2516bf117bf53b8b5959b1. 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/HKI190114902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3c2e9a633e3f5dbe98d33ab713861994d555a4874667ab0575bcc0800f5c08. 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/HKI190114903.
Stabat Mater, Op. 58, B. 71: Fac ut ardeat cor meum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a37c515edddb89d3a1cd1306dd914af1b36ab8d960147c19ae74c608cc7961. 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/HKI190114904.
Stabat Mater, Op. 58, B. 71: Tui nati vulnerati
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea9a6a7253cc597b4414bd1691da10eba120684a0ba21de3c55210f379427fb. 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/HKI190114905.
Stabat Mater, Op. 58, B. 71: Virgo virginum praeclara
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48db21dd9dd2d7185dde52d013287c82310c7ce74437e72be2ab7f1dbba002fe. 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/HKI190114907.
Stabat Mater, Op. 58, B. 71: Fac ut portem Christi mortem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe587531924bf4ee4de3bcf442f78e73180cafb619e41946257ed3454ad9e60b9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/HKI190116001.
Stabat Mater, Op. 58, B. 71: Inflammatus et accensus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf76067f8351aa7e36589d4b4419af5c3376d0447abb5a17f467452394fbcc6a. 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/HKI190116002.
Stabat Mater, Op. 58, B. 71: Quando corpus morietur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bf9f76c5cbbc293bca72763757897f6e4905ef2048238af90bcc2a9d564569. 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/HKI190116003.
Psalm 149, Op. 79, B. 91: Psalm CXLIX, Op. 79
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5225a4af6e837d50034956fd1cecbcf225080b3e4b08de5c951c5b54c3a25f21. 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/HKI190116004.