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 0x389892b0bb284aa75d8c5cabe7d2b0f4757ecf93f15c961bd35cff0056a78734. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0209cb32-40d9-4400-90de-5afffa5e244b.json and https://artists.proofprofile.net/proofs/artist/0209cb32-40d9-4400-90de-5afffa5e244b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Alma Portuguesa - Música Popular Portuguesa
Grupo Coral de Cantares Regionais de Portel
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 0x168c6e7e14635f5ae988e84e0ab2071064ba4d84905c0d016565fa99e71989da. 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/PTOV10300172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73fde15a1e47e2524057d757fb6102d4986edc05e18278d981363b477140d228. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR6V80304851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667c14b5ba3c6a3a5f33e3a291e90fef4596ccf8fd93f21d1dfd2c4343f609c3. 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/FR6V80304852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x281262f5d7110dd0c85e0097a4119cee7985066b14909e9c6e2fc5478ff3e440. 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/FR6V80304854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbb76c674747feaa33025dfb8a6589dac91093e55b85e041def4ead0e44a7a0. 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/FR6V80304855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f55004e47676e4c3c67dcaa1d1005cf9c0bf6df3935042f720959c71bcd763. 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/FR6V80304856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e576735b0dfb13ffee327e8bf9e06d5343369e022581baf7dbbd4ae73ceb39e. 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/FR6V80304857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba23acf08736b01173a08cfaeb5f875cd8051b9c9b2b9cee49a737cbd506175. 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/FR6V80304858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef95d2c5f42a98f40819fba994ad9784f0eb1ccf769e843937ac75d1b10d0d1b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FR6V80304860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aba32aa8680ca041268090ffe6ff56b6671e39e599c3a937f79c092683e62ed. 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/FR6V80304861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c931b4d59e8323754ae27e8e049d3a234cf007c33859a840819f7b83cc14bb6. 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/PTOV19100067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4efded4c0c56a9effe71cd6796b58039b4c85d0c722710991013c12908bd6261. 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/PTOV19100069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf082781e9e40fb0950a33bd5b073446cae34a90eadafc57eb6aa0cb99c0f8a. 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/PTOV19100071.