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 0x0c9002f8646ed1e5bd162ec3b4bd4d4dc1b67bdaf9e229a8b20d883c01395bf5. 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/ca003dd5-72f0-4dbd-bc99-ab94239a89ce.json and https://artists.proofprofile.net/proofs/artist/ca003dd5-72f0-4dbd-bc99-ab94239a89ce.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 0xd5ed20c55f9b8f20105546d17529b004297c08d0313fac7535152fef69055ae5. 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/QZDA52027231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42663bff94a092d15875755fbe7ef95ac595c1b475bad608e28027573e6382cf. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZDA82021114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24fd8c6059ad7b1a66917b5b2f01a664214b5c851115b1343b59ac2d25a12a6. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZHN62004841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb673346f354d9ec845f6ef0e50cfe7a3eff4983dd98b4beaa37d6edb07e729. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZHN72094463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x034e1cf04aaeea36dd122905f099325dbb90cad3972b7cb8bf5fb94380feab59. 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/QZHN82073130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6f96ff8ad2ee97adaae14b8f9b8ab431829405a7b82e38e6ecd22ce3984598. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZK6L2147187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af2d96d546b4be437329588abc26ca412a64dc81dafcdaabb4df4ffb1bababd. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZHNC2084097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff36d5336b76c865c1f5d5d35aebe1f111aa0d410561c09e0f8b02c41f561665. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZHN82109527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a846124519eea502654b1684db37b917454e0ddd019277775f279dc403d3f7. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZNWW2055079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb7959b9c05217e919ee600e1594b7567e070a862fc1f09698c8cfc8e6fcf5c. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZPLR2008805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4f37238f13dc37ea705410dc337049b10374fe78923d63f8976c53f3a52f7a. 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/QZFZ22175317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b40fff421f9b8da86e1582e0d90193b95e03d07b52a102e7d0679bc41b9c7a. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZHN82109564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240c3f9b59b287d465c495ba039b8dfcae44093421065e719ee8f02a3c70e241. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZFZ62264344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39847e3225e30ec82de26e3b5d67c142d53c8602b975f689a0c3111101b03cf9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZES62258803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dde999d4dd75a713df9ae8726f060f510a973fc5fa8e1ed7801eb5cfcfd67d6. 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/QZWDE2373881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb05b3408b3bc9b8f002b563114caae9bcf5b5fe31224bdbc294fa6903d31b6. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/GBRKQ2426218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca97b12e7a8b8e032e5ca251a61c0c62347f956023f1ede760740d264be4b78. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZWV32440472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823e84475bcb5549978d61dd72ed6722d4cdf1c48747ee43edf47bd7e91803c7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/AUBEC2479972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f44449a971c393b8022c48c3be7811f57e8195a9a9b0768ae90cd9c40fc815. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZZ8B2499822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92642666d63f7a4ea15cd21a57b83059f0855504650de34d0a04aca7b77b9d93. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/AUBEC2515170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325947af37b998ae15dcb29897099adc1c8a56151a15cb7d00fd8db1276e559e. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZNJY2510133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c8b1002d284566209ce3e7c63d8035e542a63612fbe9df2fd56ff5c7305f56. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNJY2503244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab3579dddf3455974758e7d4b6fb86c1cd23b768f7c7495d011de5ab26fda8b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNJY2593606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52c0a6e8767b7f9c00b3f36d5de15ad5159b8950634c8e5e148a21ac3d0a639. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZNJZ2557055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c8a3f0fa58a01e4968874eb03775711787e2804110a6e5d10cad0a17e8f5e03. 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/QZNJZ2521639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981f6ae8821f078e3121f4d67bd52ea0617d246ec56e03daf390c6d6013e3009. 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/QZNJZ2518229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7917f05c922b040fccb4c60cecf013c58adb27d62926c1540c6fd1c9e72a121f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTVM2563787.