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 0xde746b328759f2da2fd364d852e449b9d1bc6559182cb0314d11d3073cb98c34. 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/88bea131-079d-4bdd-b960-7f99dac6acd3.json and https://artists.proofprofile.net/proofs/artist/88bea131-079d-4bdd-b960-7f99dac6acd3.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 0xae53ba7305dcd7b0711492791b4d51a9d312d80c9c561aa4ab602ebd409989d3. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USHM81641223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7c88fcf5460a943d4021b0a6b757e50a29351edf18d8183a43de7398e672dd. 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/USHM91672072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64abe9ed941f431e8c934a758c5820251f6f0a167b4592417f3dcd654f019fbc. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USDY41728572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6682cf8e18323e2a5bfcedeef95f12c71e2ed4d4a9dd51f6db07fdeebc0990. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USHM91782143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398553a54487cfba2499a867af5c7602fe39cc0073e1d4e2ba806a1c1b813ff9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USL4Q1778318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9be4e391144844c151ce9037c132e62fb4e2bde4ddb612c19f676ace19f6470. 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/USCGJ1801450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0806bbedc74f91a0c03f901ab5296cf2757e1dc83cb6bbd3a899038065f60f68. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZES61915239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc465afa2b247fec3e119f01af1c4680482eeb4768bdc063c6f5bc0c3854e72. 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/QZFZ61960045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5285d63fd42923f17d18108f4c0d2cfa5e969b0d85a100bf7b483d42df3e4e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN41926445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c351309f9e1092bb6bac9aa2ba8451d201c3358a1393b5826f3be0287fffc3c. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZDA82033279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51116f04f292959544152485b743b1a6e35b7dd233a43b60b28e38756cd66b7. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHNA2000722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd85d7d926dc6ed71e4070733ccc4e33a00265502854d597fd7b3c0ef4363b0. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZK6K2092021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec21df266091e756f20bebf0481cd960d281f7e1f6fbd7c5cbda3c815bba6e7c. 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/QZNWS2006622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf519cda4afca14bce5502c7878e3b394c128f206f751ef753b289525df388e23. 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/US7VG1925171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da0fbead21e6e67096e880e5737f1cb398d16470e47ee86b45f8157cbb3d436. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SE5751804779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93f74e4c7c55981e9ba22421b5e08f9a8076121b7823ef8e589c06fbedec645. 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/USCGH1831791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8941174b2cd4ba7e315739526e377937cd9a465f3660958a532b6502b8ac35. 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/USDY41842135.