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 0xa6d9bf14fb918cc1b5f5d3351e49a70acf9e158aaeb3f1f927690bb0515937ab. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b4bb3e4-590e-4d92-bb5c-b0baa975ab4b.json and https://artists.proofprofile.net/proofs/artist/4b4bb3e4-590e-4d92-bb5c-b0baa975ab4b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Manang Biday (Reflections on a Folk Song)
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 0x50994d76d74325167c26e99255306d6d800dea42e3aeee0506cb04f7b3bbc45b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/HKI190584101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac8ecfb9226c1f74fc89b49c960b34dbcad616a6c6918fa6324d8c48c9ee80e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKI190584102.
Oasioas / Pandango Sa Ilaw (Dance of the Lights)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed7850a28db78a14abcc425bc6d6b8e2af9361d03c9152ff0bc91f9aaf43c09. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HKI190584103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9dea6f302bc04b337127207a51b6a2374806adf69d903e3f500eb12ae79128. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/HKI190584104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff33a48c0aaea809b66e0db983bf855d83076d4ac69e827df0079d16a84e024. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/HKI190584105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e5885e019265f0d0cebc94ac4306a0f55fd0ded6bc4697c9cdfcdf11299e41. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/HKI190584106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc996f0cc3faab567db94850669aaac932e9fcee09b1e6b7e3c8f9788d940ed. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/HKI190584107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe733fcb616a1e717ba48d942b1e31c5751a6fd8c1a353d8f15e15be3a9e00cc9. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/HKI190584108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f83f706f3a296367d112046aa6293c2eb6f9763a71b762f10dd375ef53518b. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/HKI190584109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d27343b6fbc19773d0c2cd7c4f41f6c124dd7430ec65377b6f4ab1fcebf3a5. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/HKI190584112.
Sa Ugoy Ng Duyan (Rocking of the Hammock)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c993efb8a624ff2a36a7d26d7feb943e3391ad2b190509bc5eb90ce0a55cf6. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/HKI190584113.