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 0x1fcb108e95765fd0c2dfcefd1839c2bf386d36c20c2fe0f325232ab5fc9c1e18. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1a43c34-dfc5-4b3d-8fad-9a3f7ea1cff1.json and https://artists.proofprofile.net/proofs/artist/e1a43c34-dfc5-4b3d-8fad-9a3f7ea1cff1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
O Carnaval dos Animais: I. Introdução e marcha real do leão
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 0x86083fdfa1b823fb8bc5d9504deead23db924236c47a9cd9ece16d8fc9e89d68. 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/QMDA72143239.
O Carnaval dos Animais: II. Galinhas e galos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e79931694339369defe7a29c2f8f2bfe4fae056ca636f3d194a62affde95103. 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/QMDA72143240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce96589547f48c259b1e75e1e5264b038bb458bc6b0f613cbe2c92c60190ca1. 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/QMDA72143242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018426d74e8b189da90849503cb185d52a36cab49ac267316077d9b4b86634b2. 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/QMDA72143243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ae8974ebb891e2c8bc61cf062bcd9fed906bfba4cd74c57927d1d503243fb0. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/QMDA72143244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986f9e1d422a5ec872b8e37ea9dd353c2709dd85aa4dddd4aa9d883dc0c53c00. 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/QMDA72143245.
O Carnaval dos Animais: IX. O cuco ao fundo do bosque
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c75dbbe4d9c56ef846f030d1c8d9968eaad08b8955a10b346cb7a43682f9086. 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/QMDA72143247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46a4f03330c227a23754879f779e9fbd28111b426e7c0d29d79e7bf12e484d9. 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/QMDA72143251.