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 0xe38ac805bde0a90c009124e91c5dc6805d70d9d295d37c826c62ed8c4d28d513. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d0bc7ef-6737-4532-b41e-f64ad4647de0.json and https://artists.proofprofile.net/proofs/artist/8d0bc7ef-6737-4532-b41e-f64ad4647de0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
10º Festival Nacional de Violão de Guaratinguetá - Dilermando Reis
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 0xe3af54bf606cfb646c1aa1e46f816aab4796379bd462fa8ecd8eebd7486f065f. 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/BRPOU1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d2fb54f829f957e452ab347c374b9dbf49185aa4a851ed3f0a521d02ad4c41. 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/BRPOU1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ce8b75fe38e4cb8511497a77e3823e95b6b9e311525c0446b78fc0ef66c89b. 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/BRPOU1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925b7dc8a80129dd96aab13b834a0dc84b8e4fed0989fc9d3cb23132f03c386c. 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/BRPOU1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5845ead1667636c6c90122539289eb1c42aad50a0e667d51cda219ded5841d3e. 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/FR6V81992426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08064925779bbb0d33860ee6b98194080387ef779434c492f59b3a03cabbe2d4. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/FR6V81992427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b52eafaf511b9027216f9ad13fe77148e58203be7348088ce99fd0a5e589fb4. 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/FR6V81992429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd485d344612c7fe14b12a554262d5e11a8e8bfbd43964b9990526051950b890f. 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/FR6V81992430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003b762815994b8110a5714124c29da754775811fe4ac72083ee5781f3e258fa. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/FR6V81992431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088a25aac7c7c1875747f8a7d71ff5a8eed7e673648ece8f40f8b225f15ff395. 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/FR6V81992432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128a6a8599bdf0f5e0eb71136a4f989a2aa87c00d1577920cbdcd905264a036b. 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/FR6V81992436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddbf6392d713239653611a0b8650ee8a0ea4dfa1d9d235608a315f35d92066b1. 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/FR6V81992439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08ea27fc76bbe89fec45eca3d72d796c43ca9e9283b11bfa662b7de84a76f59. 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/FR6V81992442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4771de99af018e143b8511110f2a08e1d7e4631ae1f1db19269104e3fb9eeab. 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/FR6V81992443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19a3c7f02be0819f21e84c854b79793147b52748ccaddebbdef16dae8949906. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR6V81992444.