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 0x7dc14b3f22ac95fc0602fcbe7d020a5c9fd5c260cffbcfd0a76e103923f1092d. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2eb8b9bf-1f85-4b53-881e-5686bccdef1f.json and https://artists.proofprofile.net/proofs/artist/2eb8b9bf-1f85-4b53-881e-5686bccdef1f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Taqasim: The Art of Improvisation in Arabic Music
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 0xb1767aa25e6f913ce34434535f5cca9f749a7a6fd17aa34a46154cbd434f2ff9. 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/US4BQ0401127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c77f267d4ac5358b175ebfc1b82b5a3aecca4f8037234176ade0b412322d92. 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/US4BQ0401128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fc4772451c2c20e74fd58052c9708ddf43a203eb4f2f9d95821240d4403e1f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/US4BQ0401129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8aeeaff270fa9cbcffb64fefc5b12d71de4032edaede7ed87947cc7ac4bbc6. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US4BQ0401087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab86c0e8c387595e1c17a687b05392a10c93bc23f1e19b62adc4b54cdfd10fc1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US4BQ0401088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd301b5317bbf02f46050679dc44219f4294e52b2e6377e6c418751dcb908e43b. 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/US4BQ0401089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf064a034806fe69dd7dbd0118772bb1cb5ed98ad222ef0d88d4ac3c06b6f9f3c. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/US4BQ0401090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff3c9a0f63438f7304e2b65f91a7ee6ad22a6a0d4b620ee53206511ab8af93cf. 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/US4BQ0401092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4983f96ea627501cb817a420028734cb49a30722a26e8a27941719f62f8015. 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/US4BQ0401093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba3f2f5ba88ad76b94b8fd4fe0e744d42b30c62a93f27decbef3ee0a02f1210. 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/USNO10049011.