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 0xde94461c0facf69579d1b5ef976165fdfdbac191af98686738db854f5e30fe1d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b077c0a-a229-4f92-b65e-756bc69ab195.json and https://artists.proofprofile.net/proofs/artist/3b077c0a-a229-4f92-b65e-756bc69ab195.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x15452e79190477f46d65856c2ac348d20f7098ce8877ad43d2f2947d5cd51da4. 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/QMAAK2085165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f24ba24a58a0e7a27e02b458dab2a691188c456d0d1a87bb8cda93cdcea776. 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/QMAAK2085166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bb8c5bf096a8472f26c7850fd0d6b4088c644422bc78dea44708beade32b0e. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QMAAK2085167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4693b68530124003e65ef48e5286d24ed08d12f6caf868f9b9c14413823ef531. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QMAAK2085168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3daba555788d84fda79d5c8cd6f894edba428e98057d2c063da5a7c7a1a158e5. 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/QMAAK2085169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6f58913e5f26eb968e01d35f7ab0b901e1ba76ab4aa29e4e854e1dc1697f4c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QMAAK2085170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b904e4d37cf69d6544ec8384c273626bd098d9aa60b79165f6aa729be9f73b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMAAK2085171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc1444c12aaf83e1946dff01177677f48d5425885297c50297fe460ea297ed4. 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/QMAAK2085172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1db93c036c85c1460cdcc426dc3b5c0219589d4cee5027dbe4252a3e201f1ad. 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/QMAAK2085173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e0158ced18d60434733c89e3e760ba47eec596bd8598f59a113a0dc0971dd0. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QMAAK2085174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea62ca2ad2f360740f18050941e797458cce50713a976a180e87d93db73ef36. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCADT1887555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764abfc349ee30810a65689671f504b93f21cdc145c9b71cb3c99f674e9a9add. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCADT1887569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa974b3f920556a23ee7bd289de91f3ef7bc12980c4079e6c7438efb61ce64bc7. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/TCADP1886462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274f6daf680d4a8c89d53fb06a4ee59e4b55507dc3ea184f465ae1c27fbe36c1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCADT1887572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbe09cfea507611167d117cd48cf614c2c1c60beefc076ed801a1ce676dc621. 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/TCADS1864504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4007bdb7bd215d90a1b8b7239be9efc9d3726aa55134ec41de4dd3a054f44dca. 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/TCADT1887575.